Comment ?? Comment Answer Fault Code to display in UI Fault Code in HEX (reported on IPC bus) Sub Codes (in decimal)
(0=no code)
Dealer Error Message Possible Causes Corrective Actions IDU ODU System Unit Type Alarm Status Consumer error message Model Type Pressure  Alarms   Sensor Alarms   Safety Alarms   Communication Alarm   System Alarms   Fan Failure Alarm
                                                   
 [1]   A0[2] 0x10   External protection device activated •External protection device on terminals T1-T2 of the indoor unit is activated.
•Defevtive indoor unit PCB.
•Improper field setting.
•Verify if all wires are connected to T1 & T2.  If yes then set field setting accordingly.
•Commonly used mode 22-1-03.
x     All models   Safety error Indoor unit(VRV, SkyAir)         A0            
 [3]   AO[4] 0x10 01 External protection device activated •Activation of external protection device.
•Defective indoor unit PCB.
•Indoor unit fuse blown.
•24 VAC power is not supplied to TH2 & TR2 terminals (FXTQ-TA) or R and C terminals (CXTQ-TA) on indoor unit PCB.
•Verify if all wires are connected to T1 & T2.  If yes then set field setting accordingly.
•Replace indoor unit PCB.
•Check indoor unit PCB fuse.
x     FXTQ-TA, CXTQ-TA   Safety error FXTQ-TA, CXTQ-TA                      
 [5]   A1[6] 0x11   Indoor unit PCB abnormality  •Verify correct voltage to the PCB
•Verify the HAP green LED is blinking.
•Wrong models interconnected.
•Defective indoor unit PCB.
•Disconnection of connector.
•Reduction of power supply voltage.
•Verify correct voltage to the PCB.
•Verify the HAP green LED is blinking.
x     All models   System error VRV, RA, Altherma         A1            
    A3[7] 0x13   Float switch error •Drain clogging.
•Defective drain pump.
•Defective float switch.
•Defective indoor unit PCB.
•208~230 VAC power is not provided.
•Check drain for clog.
•Check drain pump and replace if needed.
•Check indoor unit PCB and replace if needed.
•Check for power loss.
x     FXFQ-T,FXZQ-TA,FXUQ-P, FXEQ-P,FXDQ-M,FXMQ-PB,FXSQ-TA   Safety error FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXDQ-M, FXSQ-TA, FXMQ-PB
                          RA
        A3            
    A4[8] 0x14   Freeze protection error •Defective water temperature sensor.
•Low water temp temperature setting.
•Water volume shortage.
•Check water temperature sensor.
•Check water temperature setting.
•Check water volume.
x         System error RA, VRV, SkyAir, Fan Coil         A4            
    A5[9] 0x15   Heat exchanger temp error •Clogged indoor unit air filter.
•Defective indoor unit heat exchanger thermistor.
•Short-circuited air.
•Dust accumulation on the indoor heat exchanger.
•Detection error due to faulty hydro-box heat exchanger thermistor.
•Detection error due to faulty hydro-box PCB.
  x         System error RA, VRV, SkyAir, Fan Coil, Altherma         A5            
    A6[10] 0x16   Fan motor error •Defective fan motor.
•Defective indoor unit PCB.
•Defective fan motor wire harness.
•Abnormal signal output from the fan motor.
•Fan motor lock (foreign matter blocking fan blades).
•Connector between high-voltage and low-voltage is disconnected.
•Bad contact
•broken wires.
•Indoor unit safety device activated.
•High loading conditions.
•Wrong system combination.
•Check for obstruction on the fan or motor.
•Verify the input voltage at the motor.
•Check for loose or broken wires.
•Check indoor unit safety device.
x     FXFQ-T,FXZQ-TA,FXUQ-P,FXEQ-P,FXSQ05-48TA,FXMQ07-12PB,FXAQ-P,FXSQ54TA,FXMQ15-54PB,   Fan failure error RA (CTXS, FTXS, FVXS Series), RA FFQ Series, RA CDXS FDXS, FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXSQ05-48TA, FXMQ07-12PB, FXAQ-P, FXDQ-M, FXHQ-M, FXSQ54TA, FXMQ15-54PB, FXMQ-M, FXTQ-TA, VRV         A6            
    A6   01 Indoor Fan Coil Fan Motor Lock or overlaod Fault •Broken wires in, short circuit of, or disconnection of connectors from the fan motor harness.
•Defective fan motor(Broken wires or defective insulation).
•Abnormal signal output from the fan motor (defective circuit).
• Defective indoor unit control PCB.
•Instantaneous disturbance in the power supply voltage.
•Fan motor lock(Due to motor or external causes).
•The fan does not rotate due to foreign matter blocking the fan.
•Disconnection of the connector between the high-power PCB (A1P) and the low-power PCB(A2P) (FXSQ05-48TA, FXMQ07-12PB only).
Refer to Checks 16 and 17. x         Fan failure error VRV IV                      
    A6   10 Indoor Fan Coil Fan Motor Over Current Fault •Defective indoor fan motor,  Broken wires , Defective contact. Refer to Checks 16 and 17. x         Fan failure error VRV IV                      
    A6   11 Fan position detection error •Defective indoor fan motor,  Broken wires , Defective contact.   x         Fan failure error VRV IV                      
    A6   20 Indoor Fan Motor Status Abnormality •Fan or motor obstruction.
•Blocked filters.
•Power interruption (low voltage).
•Incorrect wiring.
•Blockage in the airflow (ductwork) or ductwork undersized.
•High loading conditions.
  x         Refer to Fan Motor Check 19 VRV IV                      
    A6   21 Low Indoor Airflow •Fan or motor obstruction.
•Blocked filters.
•Restrictive ductwork or ductwork undersized.
•Wiring disconnected.
•Wrong outdoor and indoor combination.
•Indoor fan motor failure.
  x         Refer to Fan Motor Check 19 FXTQ-TA                      
    A7[11] 0x17   Swing flap motor error •Defective swing flap motor.
•Defective indoor unit PCB.
•Defective connection cable.
•Defective airflow direction adjusting flap-cam.
•Check for obstruction or jamming of the swing motor mechanism.check incoming power voltage.IDU with decoration panels swing motor to be connected to IDU PCB also check for service light on swing motor PCB. x     FXHQ-M,FXAQ-P minor System error FXHQ-M, FXAQ-P         A7            
    A8[12] 0x18   Power supply voltage error •Defective power supply voltage.
•Loose or improper wiring.
•Defective connection on signal line.
•instantaneous power failure by others.
•High AC line voltage to indoor blower motor.
•Low AC line voltage to indoor blower motor.
•Incorrect wiring
•The indoor unit periodically receives control status information from the fan motor.
•Error is issued when the information shows abnormality.
•Error is detected by checking the input voltage of the fan motor.
x     FXMQ-PB,FXSQ-TA   System error FXTQ-TA, Indoor Unit (SkyAir,  VRV)         A8            
    A8   01 Power supply voltage error •Defective power supply voltage.
•Defective connection on signal line.
•Defective wiring.
•Instantaneous power failure, others.
  x         System error VRV                      
    A9[13] 0x19   Electronic expansion valve error •Defective electronic expansion valve coil.
•Defective indoor unit PCB.
•Defective relay cables.
Refer to Expansion Valve Check 18 x     FXFQ   System error VRV         A9            
    A9[14] 0x19 01 Electronic expansion valve error •Defective electronic expansion valve coil.
•Defective indoor unit PCB.
•Defective relay cables.
Refer to Expansion Valve Check 18 x     VRV IV   System error VRV IV         A9            
    A9[15] 0x19 02 Refrigerant leakage detection error •Defective electronic expansion valve coil.
•Defective indoor unit PCB.
•Defective relay cables.
•Check for deformation of the rubber packing on the EEV. 
•Check for Internal EEV leakage.
•Turn Off target indoor unit and turn ON others in Cooling mode. 
•Operate target indoor unit in Fan Mode for 10 mins,  If liquid pipe temperature decreases to evaporation temp the EEV must be replaced.
x     VRV IV   System error VRV IV         A9            
    AA     Back up or booster heater error •Malfunction of the backup heater relays [K1M, K2M].
•Incorrect parameter of the solar pump station (maximum tank temperature is too high, etc.).
•Fuse FU2 blown.
  x         System error Altherma                        
    AA   03 Gas furnace abnormality •The cause of the error differs depending on each error code of the gas furnace. Refer to the gas
furnace manual for details
  x         System error VRV IV                        
    AC     Hydro-box: Open thermal protector / fuse of booster heater •Malfunction of the booster heater relay [K3M].
•Incorrect parameter of the solar pump station (maximum tank temperature is too high, etc.).
  x         System error Altherma                        
    AF[16] 0x1F   Drain level above limit error •Humidifier unit leaking.
•Improper drain piping.
•Defective indoor unit PCB.
•Error in the drain pipe installation.
• Defective float switch.
•When the float switch changes from ON to OFF while the compressor is not in operation,  Error code is displayed but the system operates continuously. x     FXFQ-T,FXZQ-TA,FXUQ-p,FXEQ-P,FXDQ-M,FXSQ-TA,FXMQ-PB minor Safety error RA         AH(B)            
    AH 0x1B   Dust collector error •Defective dust collecting element.
•Stained insulator part.
•Defective high voltage power supply.
•Defective indoor unit PCB.
  x         System error Indoor Unit (RA,
SkyAir,
VRV)
                     
    AH   03 Transmission error (between the self-cleaning decoration panel and the indoor unit) [when the self-cleaning decoration panel is mounted] •Check for the connection of the harness connector between thepanel PCB and the indoor unit PCB.   x         System error VRV IV                      
    AH   04 Dust detection sensor error [when the self-cleaning decoration panel is mounted] •Check for the connections of the connector X12A on the panel PCB and the connectors X18A and X19A on the sensor PCB.             System error VRV IV                      
    AH   05 Dust collection sign error  [when the self-cleaning decoration panel is mounted] •Check for clogging with dust at the dust collection port as well asin the brush unit, S-shaped pipe, and dust box. Furthermore,check for any stains of the light receiving and emitting parts of theinfrared unit.             System error VRV IV                      
    AH   06 Air filter rotation error  [when the self-cleaning decoration panel is mounted] •Check for anything getting in the way of rotating the filter (e.g. thefilter comes off or the drive gear is clogged with foreign matter).             System error VRV IV                      
    AH   07 Damper rotation error  [when the self-cleaning decoration panel is mounted] •The damper does not rotate normally. Check for any foreign
matter around the damper and for the operation of the gear and
limit switch.
            System error VRV IV                      
    AH   08 Filter self-cleaning operation error  [when the self-cleaning decoration panel is mounted] •The unit has not yet completed the filter self-cleaning operation
even after the lapse of specified period of time. Check for any
external noise, etc.
            System error VRV IV                      
    AH   09 Filter self-cleaning operation start disabled error  [when the self-cleaning decoration panel is mounted] •The unit has been put into a state in which the filter self-cleaning
operation is disabled. Check the unit for the operating conditions
            System error VRV IV                      
    AJ 0x1D   Capacity setting error •Capacity setting adaptor was not installed when PCB was replaced.
•Defective indoor unit PCB.
•When replacing the IDU PCB board the capacity adaptor for the type of IDU has to be ordered. x     All models   System error Indoor Unit (SkyAir,
VRV)
                     
    AJ   01 Capacity setting error •There is an error in the capacity setting of the indoor unit PCB. •When replacing the IDU PCB board the capacity adaptor for the type of IDU has to be ordered.           System error VRV IV                      
    AJ   02 Electronic expansion valve setting error •There is a fault in the setting of the gear type electronic expansion
valve/direct acting type electronic expansion valve.
•When replacing the IDU PCB board the capacity adaptor for the type of IDU has to be ordered.           System error VRV IV                      
    C0     Hydro-box: Flow switch failure •Blocked flow switch.
•Malfunction of the flow switch.
•Water flow caused by external source.
            System error Altherma                      
    C1 0x21   PCB communication error •Defective connection between PCB's.
•Incorrect or loose wiring.
•Communication wires between the CXTQ-TA and the gas furnace are disconnected.
•Power supply to gas furnace is off.
•Defective indoor unit control PCB (A1P).
•Defective fan PCB (A2P).
•Instantaneous power failure.
•Connection defective the connector between indoor unit control PCB (A1P) and fan PCB (A2P).
•Defective indoor unit control PCB (A1P).
•Defective fan PCB (A2P).
•External factor, such as instantaneous power failure.
x     FXMQ-PB,FXSQ-TA   Communication error Indoor Unit (SkyAir,
VRV)
                     
    C1   01 Transmission error (between indoor unit PCB and the PCB for the fan) •Connection defective the connector between indoor unit control PCB (A1P) and fan PCB (A2P).
•Defective indoor unit control PCB (A1P).
•Defective fan PCB (A2P).
•External factor, such as instantaneous power failure.
•In case of voltage drop a phase monitor protection might be an advantage.           Communication error VRV IV                      
    C1   07 Blower Motor Communication Error  •Incorrect or loose wiring.
•Power interruption (low voltage).
•Check wiring or tighten wiring connections if needed.
•Verify the input voltage at the motor.
•Replace the indoor unit control PCB or motor.
          Communication error VRV                      
    C1   08 Climate Talk Communication Error •Disconnection of the communication wire between the CXTQ-TA and the gas furnace.
•Power supply to the gas furnace is cut.
•In case of voltage drop a phase monitor protection might be an advantage.           Communication error VRV                      
    C4[17] 0x24   Thermistor error •Defective liquid pipe thermistor.
•Defective indoor unit PCB.
•Loose or broken thermistor wires.
•Refer to VRV IVX Thermister Check 11. x     All models   Sensor error RA     C4                
    C5[18] 0x25   Thermistor error •Defective gas pipe thermistor.
•Defective indoor unit PCB.
•Loose or broken thermistor wires.
•Refer to RA Check 1.
•Refer to VRV IVX Thermister Check 11
x     All models   Sensor error RA, VRV     C5                
    C6[19] 0x26   IDU PCB and fan PCB combination error •Defective fan PCB (A2P).
•Loose or broken adaptor wires.
•Field setting error.
•Wrong size motor.
•Indoor unit capacity setting error.
•Locked motor.
•Defective indoor unit PCB or motor.
•Install correct motor.
•Choose correct capacity setting.
•Checked for locked rotor conditions.
•Replace the indoor unit control PCB or motor
x     FXMQ-PB,FXSQ-TA   Fan failure error VRV IV     C6                
    C6   01 Blower Motor HP Mismatch •Incorrect size motor.
•Indoor unit capacity setting error.
•Correct motor installation.
•Correct the indoor unit capacity setting.
          Fan failure error FXTQ-TA                      
    C6   02 Indoor Blower Does Not Have Required Parameters to
Function
•Locked motor rotor condition. •Check for locked rotor condition.
•Replace the indoor unit control PCB or motor.
          Fan failure error FXTQ-TA                      
    C7[20] 0x27   Direction of air flow adj. motor lock sensor error •Defective front panel driving motor.
•Defective limit switch.
  x         Fan failure error       C7                
 [21]   C9[22] 0x29   Thermistor or remote sensor error •Defective return air thermistor.
•Defective indoor unit PCB.
•Loose or broken wires.
•Defective indoor unit thermistor (R1T )
•Defective indoor unit control PCB.
•Defective indoor unit thermistor (R1T) for room temperature.
•Defective indoor unit control PCB.
•Disconnection of connector.
•Thermistor corresponding to the error code is defective.
x     All models except TXTQ-TA & CXTQ-TA   Sensor error RA, FXTQ-TA, CXTQ-TA, VRV     C9                
 [23]   CA[24] 0x2A   Discharge air temp sensor error •Defective discharge air sensor.
•Defective indoor unit PCB.
•Loose or broken wires.
•Malfunction of discharge air thermistor x     FXMQ-PB   Sensor error C4, C5: All indoor units
C9: except FXTQ-TA and CXTQ-TA models
CA: FXMQ-PB models only
    CA                
    CC[25] 0x2C   Humidity sensor error •Defective humidity sensor.
•Loose or broken wires.
  x     FXFQ-T   Sensor error FXFQ-T     CC                
    CE 0x2E 01 Infrared sensor error •Defective infrared floor sensor.
•See diagnosis procedure 1 in the service manual x     FXFQ-T,FXUQ-P   Sensor error FXFQ-T, FXUQ-P     CE                
    CE 0x2E 02 Infrared sensor error •Defective infrared floor sensor
•See diagnosis procedure 2 in the service manual x     FXFQ-T,FXUQ-P   Sensor error FXFQ-T, FXUQ-P                      
    CE 0x2E 03 Infrared sensor error •Defective infrared floor sensor
•See diagnosis procedure 3 in the service manual x     FXFQ-T,FXUQ-P   Sensor error FXFQ-T, FXUQ-P                      
    CE 0x2E 04 Infrared sensor error •Defective floor sensor element. •See diagnosis procedure 4 in the service manual x     FXFQ-T,FXUQ-P   Sensor error FXFQ-T, FXUQ-P                      
    CJ  0x2D   Remote controller temperature sensor error •Defective remote controller room temperature thermistor.
•Defective remote controller PCB.
•External factor (noise, etc.)
•Malfunction of thermostat sensor in remote controller. x     All models minor Sensor error Indoor Unit (RA,SkyAir,
VRV)
                     
What protection device?[26] reserved for future use E0[27] 0x30   Protection device activation error •Outdoor unit PCB protection device activated.
•loos or broken wires.
    x       Safety error           E0            
What is PCB?[28] PCB is a control board. E1[29] 0x31   Outdoor unit main PCB error/Defect of compressor compartment PCB •Defective outdoor unit PCB.
•Loose or broken connector wires.
•Out of control of microcomputer caused by external factors
•Noise.
•Momentary fall of voltage.
•Momentary power loss.
•Defective outdoor unit PCB.
•Defect of OD unit PCB.   x   All models   System error Condensing Unit (RA,
SkyAir,
VRV), Altherma
        E1            
    E1   01 Outdoor unit PCB error •Defective outdoor unit PCB (A1P).
•Defective connection communication line between indoor and outdoor units.
•Cycle power to outdoor master unit if error doesn't clear replace A1P board.   x       System error VRV IV                      
    E1   02 Defective outdoor unit PCB •Defective outdoor unit PCB (A1P).
•Defective connection communication line between indoor and outdoor units.
•Cycle power to outdoor master unit if error doesn't clear replace A1P board.   x       System error VRV IV                      
    E2 0x32 01 Ground leakage detection error-Master Unit •Ground fault.
•Improper wiring passing through the current sensor.
•Temporary liquid compression or melting in compressor.
•Check if the connection to the current sensor (T1A) is correctly wired.   x   All models   System error VRV IV                      
    E2   02 Ground leakage detection error-Slave Unit 1 •Ground fault.
•Improper wiring passing through the current sensor.
•Temporary liquid compression or melting in compressor.
•Use megohmeter to test for short to ground on comressor and fan motors of Slave 1 OU.   x       System error VRV IV                      
    E2   03 Ground leakage detection error-Slave Unit 2 •Ground fault.
•Improper wiring passing through the current sensor.
•Temporary liquid compression or melting in compressor.
•Use megohmeter to test for short to ground on comressor and fan motors of Slave 2 OU.   x       System error VRV IV                      
    E2 0x32 06 Missing of ground leakage detection core-Master unit •Disconnection of connector X101A.
•Loose or disconnected wiring.
•Defective outdoor unit main PCB.
•Verify terminal X101A is connected on A1P board on Master OU.   x   All models   System error VRV IV                      
    E2   07 Missing of ground leakage detection core-Salve unit 1 •Disconnection of connector X101A.
•Loose or disconnected wiring.
•Defective outdoor unit main PCB.
•Verify terminal X101A is connected on A1P board on Slave 1 OU.   x       System error VRV IV                      
    E2   08 Missing of ground leakage detection core-Slave unit 2 •Disconnection of connector X101A.
•Loose or disconnected wiring.
•Defective outdoor unit main PCB.
•Verify terminal X101A is connected on A1P board on Slave 2 OU.   x       System error VRV IV                      
    E3     Actuation of High Pressure Switch •Faulty high pressure switch.
•Disconnection in high pressure switch harness.
•Faulty connection of high pressure switch connector.
•Clogged hydraulic compartment suction filter (in heating operation).
•Dirty compressor compartment heat exchanger.
•Faulty compressor compartment fan.
•Refrigerant overcharge.
•Stop valve is left closed.
•Activation of high pressure switch.
•Defective outdoor unit main PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Altherma Check 1, 6.
•Verify Continuity across pressure switch contacts.
  x       System error Altherma MonoBloc, Condensing Unit (RA,
SkyAir,
VRV)
                     
    E3   01 Actuation of high pressure switch (HPS)-Master unit •Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x       System error VRV IV                      
    E3   02 High pressure - refrigerant overcharge or closed stop valve – Master unit •Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x       System error VRV IV                      
    E3   04 High pressure - refrigerant overcharge or closed stop valve – Slave unit 1 •Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x       System error VRV IV                      
    E3   05 Actuation of high pressure switch – Slave unit 2 •Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x       System error VRV IV                      
    E3   06 High pressure - refrigerant overcharge or closed stop valve – Slave unit 2 •Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x       System error VRV IV                      
    E3   07 High pressure standby E3 latch error (System
integrated)
•Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x       System error VRV IV                      
    E3   13 Liquid valve error-Master unit •Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x   All models   Pressure error VRV IV                      
    E3   14 Liquid valve error-Slave unit 1 •Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x   All models   Pressure error VRV IV                      
    E3   15 Liquid valve error-Slave unit 2 •Activation of high pressure switch.
•Defective high pressure switch.
•Defective control PCB (A1P).
•Momentary power failure.
•Defective high pressure sensor.
•Refer to Check 1 and Check 12.   x   All models   Pressure error VRV IV                      
    E3   18 Overall retry of high pressure switch •Abnormal drop in low pressure.
•Defective low pressure sensor.
•Defective outdoor unit main PCB.
•The stop valve is not opened.
•Refer to Check 1 and Check 12.   x   All models   Pressure error VRV IV                      
    E4[30] 0x34   Low pressure sensor error •Abnormal drop in pressure.
•Defective low pressure sensor.
•Defective outdoor main PCB.
•Stop valve is not opened.
•Faulty pressure sensor and intermittent harness.
•Faulty compressor compartment PC board.
•Abnormal drop of low pressure.
(inadequate refrigerant)
(Abnormal refrigerant piping system (liquid pipe system))
(Faulty electronic expansion valve)
Verify Continuity across pressure switch contacts.   x   All models   Pressure error Condensing Unit (SkyAir,
VRV), Altherma MonoBloc
        E4            
    E4[31]   01 Low pressure sensor error-Master unit •Abnormally drop in low pressure.
•Defective low pressure sensor.
•Defective outdoor unit PCB.
•The stop valve is not opened.
•Refer to Check 2 and 12.   x   All models   Pressure error VRV IV                      
    E4[32]   02 Low pressure sensor error-Slave unit 1 •Abnormally drop in low pressure.
•Defective low pressure sensor.
•Defective outdoor unit PCB.
•The stop valve is not opened.
•Refer to Check 2 and 12.   x   All models   Pressure error VRV IV                      
    E4[33]   03 Low pressure sensor error-Slave unit 2 •Abnormally drop in low pressure.
•Defective low pressure sensor.
•Defective outdoor unit PCB.
•The stop valve is not opened.
•Refer to Check 2 and 12.   x   All models   Pressure error VRV IV                      
    E5[34] 0x35   Compressor motor overload error •Inverter compressor lock.
•High differential pressure.
•Defective PCB.
•Stop valve is not opened.
•Refrigerant shortage.
•Four way valve malfunctioning.
•Outdoor unit PCB defective.
•Water mixed in the local piping.
•Electronic expansion valve defective.
•Stop valve defective.
•Compressor lock.
•High differential pressure (0.5 MPa (72.5 psi) or more).
•UVW connection error.
Refer to Altherma Check 4, 5, 6, 11.
•Refer to Power Transistor Check 4
  x   All models   System error Altherma, RA, VRV, Skyair         E5            
    E5[35]   01 Inverter compressor 1 lock-Master unit •Inverter compressor lock.
•High differential pressure (72.5 psi or more).
•UVW connection error.
•Defective inverter PCB.
•The stop valve is not opened.
Refer to Power Transistor Check 4   x       System error VRV IV                      
    E5[36]   02 Inverter compressor 1 lock-Slave unit 1 •Inverter compressor lock.
•High differential pressure (72.5 psi or more).
•UVW connection error.
•Defective inverter PCB.
•The stop valve is not opened.
Refer to Power Transistor Check 4   x       System error VRV IV                      
    E5[37]   03 Inverter compressor 1 lock-Slave  unit 2 •Inverter compressor lock.
•High differential pressure (72.5 psi or more).
•UVW connection error.
•Defective inverter PCB.
•The stop valve is not opened.
Refer to Power Transistor Check 4   x       System error VRV IV                      
    E5[38]   07 Inverter compressor 2 lock-Master  unit  •Inverter compressor lock.
•High differential pressure (72.5 psi or more).
•UVW connection error.
•Defective inverter PCB.
•The stop valve is not opened.
•Verify correct voltage and phase balance.
•Test diode bridge and power transistors check 4 in service manual.
•Meg ohm compressor.
  x       System error VRV IV                      
    E5[39]   08 Inverter compressor 2 lock-Slave  unit 1 •Inverter compressor lock.
•High differential pressure (72.5 psi or more).
•UVW connection error.
•Defective inverter PCB.
•The stop valve is not opened.
•Verify correct voltage and phase balance.
•Test diode bridge and power transistors check 4 in service manual.
•Meg ohm compressor.
  x       System error VRV IV                      
    E5   09 Inverter compressor 2 lock-Slave  unit 2 •Inverter compressor lock.
•High differential pressure (72.5 psi or more).
•UVW connection error.
•Defective inverter PCB.
•The stop valve is not opened.
•Verify correct voltage and phase balance.
•Test diode bridge and power transistors check 4 in service manual.
•Meg ohm compressor.
  x       System error VRV IV                      
    E6[40] 0x36   Compressor damage error  •Defective compressor.
•Defective high pressure sensor.
•Defective low pressure sensor.
•Defective ODU main PCB.
•Defective inverter PCB.
•Closed stop valve.
•Defective electronic expansion valve.
•Refer to Power Transistor Check 4 and Pressure Sensor Check 12.   x   All models   System error RA, Altherma, VRV, Skyair         E6            
    E6[41]   11 Compressor damage error:Compressor M1C (master) •Defective compressor.
•Defective high pressure sensor.
•Defective low pressure sensor.
•Defective outdoor unit main PCB.
•Defective inverter PCB.
•Refer to Power Transistor Check 4 and Pressure Sensor Check 12.   x       System error VRV IV                      
    E6[42]   13 Compressor damage error-Compressor M1C (slave 1) •Defective compressor.
•Defective high pressure sensor.
•Defective low pressure sensor.
•Defective outdoor unit main PCB.
•Defective inverter PCB.
•Refer to Power Transistor Check 4 and Pressure Sensor Check 12.   x       System error VRV IV                      
    E6[43]   15 Compressor damage error-Compressor M1C (slave 2) •Defective compressor.
•Defective high pressure sensor.
•Defective low pressure sensor.
•Defective outdoor unit main PCB.
•Defective inverter PCB.
•Refer to Power Transistor Check 4 and Pressure Sensor Check 12.   x       System error VRV IV                      
    E6[44]   17 Compressor damage warning:Compressor M1C (master) •Defective compressor.
•Defective high pressure sensor.
•Defective low pressure sensor.
•Defective outdoor unit main PCB.
•Defective inverter PCB.
•Refer to Power Transistor Check 4 and Pressure Sensor Check 12.   x       System error VRV IV                      
    E6[45]   19 Compressor damage warning-Compressor M1C (slave 1) •Defective compressor.
•Defective high pressure sensor.
•Defective low pressure sensor.
•Defective outdoor unit main PCB.
•Defective inverter PCB.
•Refer to Power Transistor Check 4 and Pressure Sensor Check 12.   x       System error VRV IV                      
    E6[46]   21 Compressor damage warning-Compressor M1C (slave 2) •Defective compressor.
•Defective high pressure sensor.
•Defective low pressure sensor.
•Defective outdoor unit main PCB.
•Defective inverter PCB.
•Refer to Power Transistor Check 4 and Pressure Sensor Check 12.   x       System error VRV IV                      
    E7[47] 0x37   Outdoor fan motor/DC Fan Lock error •Defective fan motor.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes
•Fan motor can not rotate due to obstruction.
•Loose wire harness connection.
•Missing L1 voltage.
•Defective outdoor unit PCB
Refer to Fan Motor Check 16 and 17 Final   x   REYQ-XATJU,REYQ-XAYDU   System error RA, VRV, Skyair, Altherma         E7            
    E7   01 Fan motor 1 lock – Master unit •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   02 Fan motor 2 lock – Master unit •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   05 Fan motor 1 momentary overcurrent – Master unit •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   06 Fan motor 2 momentary overcurrent – Master unit •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   09 Fan motor 1 IPM error – Master unit •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   10 Fan Motor M2F IPM Error in Master unit •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   13 Fan motor M1F lock ( Sub Unit 1) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   14 Fan motor M2F lock (Sub Unit 1) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   17 Fan motor M1F momentary overcurrent (Sub Unit 1) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   18 Fan motor M2F momentary overcurrent (Sub Unit 1) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   21 Fan motor M1F IPM error (Sub Unit 1) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   22 Fan motor M2F IPM error (Sub Unit 1) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   25 Fan motor M1F lock (Sub Unit 2) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   26 Fan motor M2F lock (Sub Unit 2) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   29 Fan motor M1F momentary overcurrent (Sub Unit 2) •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   30 Fan motor 2 momentary overcurrent – Slave unit 2 •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   33 Fan motor 1 IPM error – Slave unit 2 •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E7   34 Fan motor 2 IPM error – Slave unit 2 •Fan motor failure.
•Neglect to connect or defective connection of harness/connector between the fan motor and the PCB.
•Fan does not rotate due to foreign matter caught in it.
•Clearing condition: fan motor performs normal operation for a period of 5 minutes.
Refer to Fan Motor Check 16 and 17 Final   x       System error VRV IV                      
    E8[48] 0x38   Compressor overcurrent error •Defective compressor.
•Defective inverter main circuit capacitor .
•Defective outdoor unit PCB.
•Defective power transistor.
•Over-current due to compressor failure.
•Over-current due to defective power transistor.
•Over-current due to defective inverter main circuit electrolytic capacitor.
•Over-current due to defective outdoor unit PCB.
•Error detection due to outdoor unit PCB.
•Over-current due to short-circuit.
•RA Check 15, 17, 18.
•Refer to Altherma Check 7, 8, 14.
  x       System error RA, Altherma split         E8            
    E9[49] 0x39   Electronic expansion valve error •Over-current due to compressor failure.
•Over-current due to defective power transistor.
•Over-current due to defective inverter main circuit electrolytic capacitor.
•Over-current due to defective outdoor unit PCB.
•Error detection due to outdoor unit PCB.
•Over-current due to short-circuit.
    x   All models   System error Altherma MonoBloc         E9            
    E9   01 Electronic expansion valve  (Y1E) error – Master unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   03 Electronic expansion valve (Y2E) error – Master unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   04 Electronic expansion valve  (Y3E) error – Master unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   05 Electronic expansion valve  (Y1E) error – Slave unit 1 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   06 Electronic expansion valve (Y2E) error – Slave unit 1 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   07 Electronic expansion valve (Y3E) error – Slave unit 1 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   08 Electronic expansion valve (Y1E) error – Slave unit 2 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
        09 Electronic expansion valve (Y2E) error – Slave unit 2 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x         VRV IV                      
    E9   10 Electronic expansion valve (Y3E) error – Slave unit 2 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   20 Defective electronic expansion valve 1 coil (Y1E) – Master unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   21 Defective electronic expansion valve 1 coil (Y1E) – Slave unit 1 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   22 Defective electronic expansion valve 1 coil (Y1E) – Slave unit 2 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   23 Defective electronic expansion valve 2 coil (Y2E) – Master unit[50] •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   24 Defective electronic expansion valve 2 coil (Y2E) – Slave unit 1 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   25 Defective electronic expansion valve coil (Y2E)
(Slave 2)
•Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   26 Electronic expansion valve  (Y4E) error – Master unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   27 Electronic expansion valve (Y4E) error – Slave 1 unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   28 Electronic expansion valve  (Y4E) error – Slave 2 unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   29 Electronic expansion valve  (Y5E) error – Master unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   32 Electronic expansion valve (Y7E) error – Master unit •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   34 Electronic expansion valve (Y5E) error – Slave unit 1 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   37 Electronic expansion valve (Y7E) error – Slave unit 1 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   39 Electronic expansion valve (Y5E) error – Slave unit 2 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
    E9   42 Electronic expansion valve (Y7E) error – Slave unit 2 •Disconnection of connectors from electronic expansion valves.
•Defective electronic expansion valve coil.
•Defective outdoor unit main PCB.
•Refer to Expansion Valve Check 18.   x       System error VRV IV                      
Not sure what four side valve is?[51] this is four way valve EA[52] 0x3A   Cool/heat switch error or four side valve switch defect •Defective four way valve.
•shortage of gas.
•Defective outdoor unit PCB.
•Connector in poor contact.
•Thermistor defective.
•Outdoor unit PCB defective.
•Four way valve coil or harness defective.
•Four way valve defective.
•Foreign substance mixed in refrigerant.
•Insufficient gas.
•Refer to RA Check 1, 13, 14.
•Refer to Altherma Check 5, 6, 11
  x       System error RA         EA            
What water is it referring to?[53] entering water temperature.  This is for VRV hot water supply unit, such as Mega-Q EC[54] 0x3C   Domestic hot water tank temperature too high (> 192°F/89°C) •defective thermistor.
•Defective outdoor unit PCB.
•Cooling water temp abnormality.
•Shortage of gas.
Refer to RA Check 1, 13, 14   x       Sensor error Altherma          EC            
What sensors is it referring to?[55] malfunction of sensor system of compressor H0[56] 0x40   Compressor system error •Reactor disconnection.
•Compressor disconnection.
•Outdoor unit PCB defective.
•Compressor defective.
•Disconnection of reactor.
•Disconnection of compressor harness.
•Defective outdoor unit PCB.
    x       System error Altherma split, RA     H0                
    H3[57] 0x43   High pressure switch error •Incomplete high pressure switch.
•Disconnection in high pressure switch harness.
•Faulty connection of high pressure switch connector.
•Faulty compressor compartment PC board.
•Disconnected lead wire.
•Verify electrical wiring.
•Verify ODU PCB.
•Verify high Pressure Switch.
  x   All models minor Pressure error Altherma MonoBloc, VRV II
SkyAir,
VRV)
    H3                
    H3[58]   02 Harness abnormality (Main & inverter PCB) -
Master unit
•Defective connection of jumpers between PCB.
•Defective control PCB (A1P).
•Defective inverter PCB.
•Check compressor isulation resistance. Check Odu fan motor and inverter board.   x       System error VRV IV                      
    H3[59]   03 Connection error (Control & INV. 2 (A6P)) – Master unit •Defective connection of jumpers between PCB.
•Defective control PCB (A1P).
•Defective inverter PCB.
•Check compressor isulation resistance. Check Odu fan motor and inverter board.   x       System error VRV IV                      
    H3[60]   04 Harness abnormality (Main & inverter PCB) -
Slave unit 1
•Defective connection of jumpers between PCB.
•Defective control PCB (A1P).
•Defective inverter PCB.
•Check compressor isulation resistance. Check Odu fan motor and inverter board.   x       System error VRV IV                      
    H3[61]   05 Connection error (Control & INV. 2 (A6P)) – Slave unit 1 •Defective connection of jumpers between PCB.
•Defective control PCB (A1P).
•Defective inverter PCB.
•Check compressor isulation resistance. Check Odu fan motor and inverter board.   x       System error VRV IV                      
    H3[62]   06 Harness abnormality (Main & inverter PCB) -
Slave unit 2
•Defective connection of jumpers between PCB.
•Defective control PCB (A1P).
•Defective inverter PCB.
•Check compressor isulation resistance. Check Odu fan motor and inverter board.   x       System error VRV IV                      
    H3[63]   07 Connection error (Control & INV. 2 (A6P)) – Slave unit 2 •Defective connection of jumpers between PCB.
•Defective control PCB (A1P).
•Defective inverter PCB.
•Check compressor isulation resistance. Check Odu fan motor and inverter board.   x       System error VRV IV                      
    H4[64] 0x44   Low pressure switch error •Defective low pressure switch.
•Defective outdoor unit PCB.
•Loose or broken wire.
Verify electrical wiring
Verify ODU PCB
Verify Low Pressure Switch
  x       Pressure error VRV II     H4                
    H5[65] 0x45   Compressor motor overload sensor error •Defective motor overload sensor.
•Loose or broken wire.
    x       System error       H5                
    H6[66] 0x46   Position detection sensor error/Compressor Startup Failure •Compressor relay cable disconnected.
•Compressor itself defective.
•Outdoor unit PCB defective.
•Stop valve closed.
•Input voltage out of specification.
•Power supply voltage is not as specified.
•Disconnection of the compressor harness.
•Refer to Altherma Check 13.
•Refer to RA Check 15, 18, 20.
  x       Sensor error Altherma, RA      H6                
    H7[67] 0x47   Outdoor unit fan failure error •Short in fan motor leads.
•Abnormal signal from fan motor.
•Loose or broken wires.
•Defective outdoor unit PCB (A3P)
•Check for the connector of the fan motor.   
•Check resistance between Vcc and UVW and between GND.
•Check if UVW of the fan motor lead are in balance.
  x   REYQ-XATJU,REYQ-XAYDU   Fan failure error Condensing Unit (SkyAir,
VRV III)
    H7                
    H7[68]   01 Motor position signal abnormality (Master): M1F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[69]   02 Motor position signal abnormality (Master): M2F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[70]   05 Motor position signal abnormality (Slave 1): M1F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[71]   06 Motor position signal abnormality (Slave 1): M2F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[72]   09 Fan motor 1 signal detection error – Slave unit 2 •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[73]   10 Fan motor 2 signal detection error – Slave unit 2 •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[74]   21 Defective fan PCB (Master): M1F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[75]   22 Defective fan PCB (Master): M2F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[76]   23 Defective fan PCB (Slave 1): M1F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[77]   24 Defective fan PCB (Slave 1): M2F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[78]   25 Defective fan PCB (Slave 2): M1F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H7[79]   26 Defective fan PCB (Slave 2): M2F •Abnormal signal from fan motor (Circuit failure).
•Disconnection/Short circuit in fan motor leads or disconnection of connector.
•Defective inverter PCB.
•Refer to Fan Motor Check 17.   x       Fan failure error VRV IV                      
    H8[80] 0x48   CT or Related Abnormality •Malfunction of compressor input (CT) system.
•Defect of power transistor.
•Faulty wiring of inverter system.
•Reactor defective.
•Defect of condensing unit PCB.
Refer To RA Check 15, 21   x       Sensor error RA, Altherma split     H8                
    H9[81] 0x49   Outdoor temperature sensor/P4, J3, J6, H9” Thermistor or Related Abnormality (Outdoor Unit)  error •Disconnection of the connector for the thermistor.
•Thermistor corresponding to the error code is defective.
•Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger thermistor.
•In cooling operation, or indoor heat exchanger thermistor in heating operation).
•Defective outdoor unit PCB.
•Hydro-box PCB defective.
•Connector in poor contact.
•Refer to RA Check 1.
•Connector & Symbol varies per model. Refer to correct Service Manual.
•Refer to Altherma Check 6.
  x   All models   Sensor error RA, VRV, Skyair, Altherma     H9                
H9[82] H9[83] H9[84]   01 Defective outdoor air thermistor – Master unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.           Sensor error VRV IV                      
H9[85] H9[86] H9[87]   02 Defective outdoor air thermistor – Slave unit 1 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.           Sensor error VRV IV                      
H9[88] H9[89] H9[90]   03 Defective outdoor air thermistor – Slave unit 2 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.           Sensor error VRV IV                      
What water and oil is it referring to?[91] water temperature of the heat exchanger(VRV4W) HC[92] 0x4C   Water inlet thermistor (R9T) abnormality
Water outlet thermistor (R10T) abnormality/Thermistor or Related Abnormality (Hydro-box).
•Faulty connector connection.
•Faulty thermistor.
•Faulty outdoor unit PCB.
•Refer to Altherma Check 6.   x       Sensor error Altherma/VRV-W     HC                
    HC[93]   03 Defective water inlet thermistor (R9T) (Master) •Defective connection of thermistor.
•Defective thermistor.
•Defective outside unit PCB.
•Water Cooled Thermistor Check 11.   x       Sensor error VRV-W                      
    HC[94]   04 Defective water inlet thermistor (R9T) (Slave 1) •Defective connection of thermistor.
•Defective thermistor.
•Defective outside unit PCB.
•Water Cooled Thermistor Check 11.   x       Sensor error VRV-W                      
    HC[95]   05 Defective water inlet thermistor (R9T) (Slave 2) •Defective connection of thermistor.
•Defective thermistor.
•Defective outside unit PCB.
•Water Cooled Thermistor Check 11.   x       Sensor error VRV-W                      
    HC[96]   06 Defective water outlet thermistor (R10T) (Master) •Defective connection of thermistor.
•Defective thermistor.
•Defective outside unit PCB.
•Water Cooled Thermistor Check 11.   x       Sensor error VRV-W                      
    HC[97]   07 Defective water outlet thermistor (R10T) (Slave 1) •Defective connection of thermistor.
•Defective thermistor.
•Defective outside unit PCB.
•Water Cooled Thermistor Check 11.   x       Sensor error VRV-W                      
    HC[98]   08 Defective water outlet thermistor (R10T) (Slave 2) •Defective connection of thermistor.
•Defective thermistor.
•Defective outside unit PCB.
•Water Cooled Thermistor Check 11.   x       Sensor error VRV-W                      
    HJ[99] 0x4D   Malfunction of water system •Clogged water piping system.
•Insufficient heat exchanger water.
•Dirty heat exchanger.
•Disconnected connector.
•Defective thermistor on the heat exchanger gas side.
•Defective low pressure sensor.
•Water Cooled Thermistor Check 11.   x       System error VRV-W     HJ(D)                
    HJ[100]   01 Water system abnormality (Master) •Clogged water piping system.
•Insufficient heat exchanger water.
•Dirty heat exchanger.
•Disconnected connector.
•Defective thermistor on the heat exchanger gas side.
•Defective low pressure sensor.
•Water Cooled Thermistor Check 11.           System error VRV-W                      
    HJ[101]   02 Water system abnormality (Slave 1) •Clogged water piping system.
•Insufficient heat exchanger water.
•Dirty heat exchanger.
•Disconnected connector.
•Defective thermistor on the heat exchanger gas side.
•Defective low pressure sensor.
•Water Cooled Thermistor Check 11.           System error VRV-W                      
    HJ[102]   03 Water system abnormality (Slave 2) •Clogged water piping system.
•Insufficient heat exchanger water.
•Dirty heat exchanger.
•Disconnected connector.
•Defective thermistor on the heat exchanger gas side.
•Defective low pressure sensor.
•Water Cooled Thermistor Check 11.           System error VRV-W                      
    HJ[103]   04 Water system abnormality (System) •Clogged water piping system.
•Insufficient heat exchanger water.
•Dirty heat exchanger.
•Disconnected connector.
•Defective thermistor on the heat exchanger gas side.
•Defective low pressure sensor.
•Water Cooled Thermistor Check 11.           System error VRV-W                      
    HJ[104]   05 Abnormality by the temperature rise of the liquid
refrigerant
•Clogged water piping system.
•Insufficient heat exchanger water.
•Dirty heat exchanger.
•Disconnected connector.
•Defective thermistor on the heat exchanger gas side.
•Defective low pressure sensor.
•Water Cooled Thermistor Check 11.           System error VRV-W                      
Is this error in conjunction with F1&F2?[105] F0 F1 F2 reserved for future use F0[106] 0x50   No.1, No.2 system common protection device activation       x       Safety error           F0            
    F1[107] 0x51   No.1 system protection device activation       x       Safety error           F1            
    F2[108] 0x52   No.2 system protection device activation       x       Safety error           F2            
    F3[109] 0x53   Discharge pipe temp error •Abnormal discharge pipe temperature.
•Abnormal compressor surface temperature.
•Defective discharge pipe thermistor.
•Defective compressor body thermistor.
•Defective outdoor unit main PCB.
    x   All models   Sensor error           F3            
    F4[110] 0x54   Compressor suction temp error •Defective suction pipe thermistor.
•Defective compressor suction thermistor.
•Defective discharge pipe thermistor.
•Defective high pressure sensor.
•Defective indoor unit electronic expansion valve.
•Dirty air filter.
    x   All models   System error           F4            
    F6[111] 0x56   Refrigerant overcharged •Refrigerant overcharge.
•Outdoor air thermistor disconnected.
•Heat exchanger deicer thermistor disconnected.
•Liquid pipe temperature thermistor disconnected.
    x   All models   Pressure error           F6            
    F9 0x59   Expansion valve branch selector error •Expansion valve connector disconnected.
•Defective expansion valve coil.
•Defective branch selector PCB.
    x   Branch selector unit   System error                        
    FA[112] 0x5A   Discharge pressure error       x       Sensor error           FA            
    FH[113] 0x5B   High oil temp error       x       Sensor error           FH(B)            
    FC[114] 0x5C   Suction pressure error        x       Sensor error           FC            
    FJ[115] 0x5D   Engine exhaust gas temp error       x       Pressure error           FJ(D)            
    FE[116] 0x5E   Hydraulic pressure error       x       Pressure error           FE            
    FF[117] 0x5F   Oil pressure error or compressor out of oil       x       Pressure error           FF            
    J0[118] 0x60   Refrigerant temp sensor error       x       Sensor error       J0                
    J1[119] 0x61   Pressure sensor error •Faulty pressure sensor.
•Faulty compressor compartment PC board.
•Incorrect connection of connector.
    x       Sensor error Altherma MonoBloc     J1                
    J2[120] 0x62   Current sensor error •Defective current sensor.
•Defective outdoor unit PCB.
•Defective compressor.
    x       Sensor error VRV II & III     J2                
    J3[121] 0x63   Discharge pipe temp sensor error •Defective thermistor (R3T, R31T, R32T) for outdoor unit discharge pipe.
•Defective outdoor unit PCB (A1P).
•Defective thermistor connection.
•Condenser thermistor defective in the case of J3 error (outdoor unit heat exchanger thermistor in the cooling mode, or hydro-box heat exchanger thermistor in the heating mode).
•Refer to RA Check 1.
•Refer to Altherma Check 6.
•Refer to VRV III Thermistor Check.
  x   All models   Sensor error RA, Altherma, VRV, Skyair, VRV III     J3                
    J3[122]   16 Defective discharge pipe 1 thermistor: Open – Master unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[123]   17 Defective discharge pipe 1 thermistor: Short – Master unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[124]   22 Defective discharge pipe 1 thermistor: Open – Slave unit 1 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[125]   23 Defective discharge pipe 1 thermistor: Short – Slave unit 1 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[126]   28 Defective discharge pipe 1 thermistor: Open – Slave unit 2 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[127]   29 Defective discharge pipe 1 thermistor: Short – Slave unit 2 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[128]   47 Defective compressor surface thermistor: Open – Master unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[129]   48 Defective compressor surface thermistor: Short – Master unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[130]   49 Defective compressor surface thermistor: Open – Slave unit 1 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[131]   50 Defective compressor surface thermistor: Short – Slave unit 1 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[132]   51 Defective compressor surface thermistor: Open – Slave unit 2 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[133]   52 Defective compressor surface thermistor: Short – Slave unit 2 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[134]   56 Discharge pipe warning – Master unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[135]   57 Discharge pipe warning – Slave unit 1 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J3[136]   58 Discharge pipe warning – Slave unit 2 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J4[137] 0x64   Outdoor Unit: Malfunction of Temperature Sensor for Heat Exchanger Gas (R2T or R11T) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•VRV III Thermistor Check Final.   x       Sensor error Condensing Unit (VRV III)     J4                
    J4[138]   02 Defective plate heat exchanger gas thermistor
(R4T) (Master)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Water Cooled Thermistor Check 11.           Sensor error VRV IV                      
    J4[139]   04 Defective plate heat exchanger gas thermistor
(R4T) (Slave 1)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Water Cooled Thermistor Check 11.           Sensor error VRV IV                      
    J4[140]   06 Defective plate heat exchanger gas thermistor
(R4T) (Slave 2)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Water Cooled Thermistor Check 11.           Sensor error VRV IV                      
    J5[141] 0x65   Suction pipe temp sensor/H9, J3, J5, J6, J7, J8” Thermistor or Related Abnormality (Outdoor Unit) error •Defective thermistor.
•Defective main outdoor PCB.
•Loose or broken wire.
• Defective thermistor (R8T or R10T) for outdoor unit suction pipe.
•Refer to Altherma Check 3, 4, 5.   x   All models   Sensor error Altherma MonoBloc, Condensing Unit (RA, SkyAir, VRV III)     J5                
    J5[142]   01 Defective compressor suction thermistor (R12T)
(Master)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J5[143]   03 Defective compressor suction thermistor (R12T)
(Slave 1)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J5[144]   05 Defective compressor suction thermistor (R12T)
(Slave 2)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J5[145]   18 Error detection of suction pipe thermistor (R10T) (Master) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J5[146]   19 Error detection of suction pipe thermistor (R10T) (Slave 1) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J5[147]   20 Error detection of suction pipe thermistor (R10T) (Slave 2) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[148] 0x66   Heat exchanger gas pipe temp sensor/P4, J3, J6, H9” Thermistor or Related Abnormality (Outdoor Unit) error •Connector in poor contact.
•Thermistor defective.
•Outdoor unit PCB defective.
•Hydro-box PCB defective.
•Condenser thermistor defective in the case of J3 error (outdoor unit heat exchanger thermistor in the cooling mode, or hydro-box heat exchanger thermistor in the heating mode).
•Refer to Altherma Check 6.
•Refer to RA Check 1.
•Refer to VRV III Thermistor Check.
  x   All models   Sensor error Altherma, RA, VRV, Skyair, VRV, Skyair     J6                
    J6[149]   01 Defective heat exchanger deicer thermistor – Master unit/Defective plate heat exchanger liquid thermistor
(R7T) (Master)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.
•Water Cooled Thermistor Check 11.
  x       Sensor error VRV IV, VRVW IV                      
    J6[150]   02 Defective heat exchanger deicer thermistor – Slave unit 1/Defective plate heat exchanger liquid thermistor
(R7T) (Slave 1)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.
•Water Cooled Thermistor Check 11.
  x       Sensor error VRV IV, VRVW IV                      
    J6[151]   03 Defective heat exchanger deicer thermistor – Slave unit 2/Defective plate heat exchanger liquid thermistor
(R7T) (Slave 2)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.
•Water Cooled Thermistor Check 11.
  x       Sensor error VRV IV, VRVW IV                      
    J6[152]   08 Defective heat exchanger gas upper thermistor (Master) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[153]   09 Defective heat exchanger gas upper thermistor (Slave 1) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[154]   10 Defective heat exchanger gas upper thermistor (Slave 2) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[155]   11 Defective heat exchanger gas lower thermistor (Master) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[156]   12 Defective heat exchanger gas lower thermistor (Slave 1) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[157]   13 Defective heat exchanger gas lower thermistor (Slave 2) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[158]   14 Error detection of heat exchanger gas upper thermistor (Master) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[159]   16 Error detection of heat exchanger gas upper thermistor (Slave 1) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[160]   17 Error detection of heat exchanger gas upper thermistor (Slave 2) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[161]   18 Error detection of heat exchanger gas lower thermistor (Master) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J6[162]   19 Error detection of heat exchanger gas lower thermistor (Slave 1) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[163] 0x67   Subcooling heat exchanger liquid temp sensor/H9, J3, J5, J6, J7, J8” Thermistor or Related Abnormality (Outdoor Unit) error •Defective thermistor.
•Defective main outdoor PCB.
•Loose or broken wire.
•Faulty compressor compartment PC board (control PC board).
•Refer to VRV III Thermistor Check.
•Refer to Altherma Check 3, 4, 5
  x   All models   Sensor error Condensing Unit (SkyAir,
VRV III), Altherma MonoBloc
    J7                
    J7[164]   01 Defective receiver inlet thermistor
(Master)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[165]   02 Defective receiver inlet thermistor
(Slave 1)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[166]   03 Defective receiver inlet thermistor
(Slave 2)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[167]   06 Defective subcooling liquid pipe thermistor – Master unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[168]   07 Defective subcooling liquid pipe thermistor – Slave unit 1 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[169]   08 Defective subcooling liquid pipe thermistor – Slave unit 2 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[170]   17 Standby for preventing fusible plug removal •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[171]   18 Defective subcooling injection thermistor
 (Master)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[172]   19 Defective subcooling injection thermistor
 (Slave 1)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J7[173]   20 Defective subcooling injection thermistor
 (Slave 2)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J8[174] 0x68   Heat exchanger liquid pipe temp sensor/H9, J3, J5, J6, J7, J8” Thermistor or Related Abnormality (Outdoor Unit) error •Disconnection of the connector for the thermistor.
•Thermistor corresponding to the error code is defective.
•Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger thermistor in cooling operation, or indoor heat exchanger thermistor in heating operation).
•Defective outdoor unit PCB.
•Faulty compressor compartment PC board (control PC board).
•Refer to RA Check 1.
•Refer to Altherma Check 3, 4, 5.
  x   All models   Sensor error RA, Altherma MonoBloc     J8                
    J8[175]   01 Defective heat exchanger liquid upper
thermistor (R4T) (Master)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J8[176]   02 Defective heat exchanger liquid pipe thermistor (R4T) – Slave unit 1 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J8[177]   03 Defective heat exchanger liquid pipe thermistor (R4T) – Slave unit 2 •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J8[178]   08 Defective heat exchanger liquid lower
thermistor (R5T) (Master)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J8[179]   09 Defective heat exchanger liquid lower
thermistor (R5T) (Slave 1)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J8[180]   10 Defective heat exchanger liquid lower
thermistor (R5T) (Slave 2)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[181] 0x69   Gas pipe purge temp sensor error •Defective thermistor.
•Defective main outdoor PCB.
•Loose or broken wire.
•Disconnection of the connector for the thermistor.
•Thermistor corresponding to the error code is defective.
•Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger thermistor in cooling operation, or indoor heat exchanger thermistor in heating operation).
•Refer to RA Check 1.
•Use mode 1-52 to staart and compare.Ohm out sensor and compare to service manual chart.Use temperature probe thermister to compare as well.See flow chart in service manual.
  x   All models   Sensor error RA, VRV, Skyair     J9                
    J9[182]   01 Defective subcooling heat exchanger gas pipe
thermistor (R6T) (Master)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[183]   02 Defective subcooling heat exchanger gas pipe
thermistor (R6T) (Slave 1)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[184]   03 Defective subcooling heat exchanger gas pipe
thermistor (R6T) (Slave 2)
•Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[185]   08 Error detection - Failure of sub-cool heat exchanger outlet thermistor – Master Unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[186]   09 Error detection - Failure of sub-cool heat exchanger outlet thermistor – Slave 1 Unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[187]   10 Error detection - Failure of sub-cool heat exchanger outlet thermistor – Slave 2 Unit •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[188]   11 Receiver gas purge thermistor (R13T) (Master) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[189]   12 Receiver gas purge thermistor (R13T) (Slave 1) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    J9[190]   13 Receiver gas purge thermistor (R13T) (Slave 2) •Defective connection of thermistor.
•Defective thermistor.
•Defective outdoor unit PCB.
•Refer to VRV IVX Thermister Check 11.   x       Sensor error VRV IV                      
    JA[191] 0x6A   High pressure sensor error •Defective high pressure switch.
•Defective outdoor unit main PCB.
•Defective high pressure sensor connection.
•Misconnection between low and high pressure sensors.
•Refer to Pressure Sensor Check 12.   x   All models   Pressure error Condensing Unit (SkyAir,
VRV III)
    JA                
    JA[192]   06 Defective high pressure sensor (S1NPH): Open
(Master)
•Defective high pressure sensor.
•Connection of low pressure sensor in mistake for high pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of high pressure sensor.
•Refer to Pressure Sensor Check 12.   x       Pressure error VRV IV                      
    JA[193]   07 Defective high pressure sensor (S1NPH): Short
(Master)
•Defective high pressure sensor.
•Connection of low pressure sensor in mistake for high pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of high pressure sensor.
•Refer to Pressure Sensor Check 12.   x       Pressure error VRV IV                      
    JA[194]   08 Defective high pressure sensor (S1NPH): Open
(Slave 1)
•Defective high pressure sensor.
•Connection of low pressure sensor in mistake for high pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of high pressure sensor.
•Refer to Pressure Sensor Check 12.   x       Pressure error VRV IV                      
    JA[195]   09 Defective high pressure sensor (S1NPH): Short
(Slave 1)
•Defective high pressure sensor.
•Connection of low pressure sensor in mistake for high pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of high pressure sensor.
•Refer to Pressure Sensor Check 12.   x       Pressure error VRV IV                      
    JA[196]   10 Defective high pressure sensor (S1NPH): Open
(Slave 2)
•Defective high pressure sensor.
•Connection of low pressure sensor in mistake for high pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of high pressure sensor.
•Refer to Pressure Sensor Check 12.   x       Pressure error VRV IV                      
    JA[197]   11 Defective high pressure sensor (S1NPH): Short
(Slave 2)
•Defective high pressure sensor.
•Connection of low pressure sensor in mistake for high pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of high pressure sensor.
•Refer to Pressure Sensor Check 12.   x       Pressure error VRV IV                      
    JH[198] 0x6B   Oil temp sensor error       x       Sensor error       JH(B)                
    JC[199] 0x6C   Low pressure sensor error •Defective low pressure switch.
•Defective outdoor unit main PCB.
•Defective high pressure sensor connection.
•Misconnection between low and high pressure sensors.
•Refer to Pressure Sensor Check 12.   x   All models   Pressure error Condensing Unit (SkyAir,
VRV III)
    JC                
    JC[200]   06 Defective low pressure sensor: Open – Master unit •Defective low pressure sensor.
•Connection of high pressure sensor in mistake for low pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of low pressure sensor.
•In recovery mode with service checker connected and analog gauge on service port compare gauge pressure to service checker reporting pressure furmore make voltage comparison using checks 12 and 14 in service manual.   x       Pressure error VRV IV                      
    JC[201]   07 Low pressure sensor abnormality. Short – Master unit •Defective low pressure sensor.
•Connection of high pressure sensor in mistake for low pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of low pressure sensor.
•In recovery mode with service checker connected and analog gauge on service port compare gauge pressure to service checker reporting pressure furmore make voltage comparison using checks 12 and 14 in service manual.   x       Pressure error VRV IV                      
    JC[202]   08 Low pressure sensor abnormality. Open – Slave unit 1 •Defective low pressure sensor.
•Connection of high pressure sensor in mistake for low pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of low pressure sensor.
•In recovery mode with service checker connected and analog gauge on service port compare gauge pressure to service checker reporting pressure furmore make voltage comparison using checks 12 and 14 in service manual.   x       Pressure error VRV IV                      
    JC[203]   09 Low pressure sensor abnormality. Short – Slave unit 1 •Defective low pressure sensor.
•Connection of high pressure sensor in mistake for low pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of low pressure sensor.
•In recovery mode with service checker connected and analog gauge on service port compare gauge pressure to service checker reporting pressure furmore make voltage comparison using checks 12 and 14 in service manual.   x       Pressure error VRV IV                      
    JC[204]   10 Low pressure sensor abnormality. Open – Slave unit 2 •Defective low pressure sensor.
•Connection of high pressure sensor in mistake for low pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of low pressure sensor.
•In recovery mode with service checker connected and analog gauge on service port compare gauge pressure to service checker reporting pressure furmore make voltage comparison using checks 12 and 14 in service manual.   x       Pressure error VRV IV                      
    JC[205]   11 Low pressure sensor abnormality. Short – Slave unit 2 •Defective low pressure sensor.
•Connection of high pressure sensor in mistake for low pressure sensor.
•Defective outdoor unit PCB.
•Defective connection of low pressure sensor.
•In recovery mode with service checker connected and analog gauge on service port compare gauge pressure to service checker reporting pressure furmore make voltage comparison using checks 12 and 14 in service manual.   x       Pressure error VRV IV                      
    JJ[206] 0x6D   Engine room temp error, or engine exhaust gas temp sensor disconnected       x       Sensor error       JJ(D)                
    JE[207] 0x6E   Hydraulic pressure sensor error       x       Sensor error       JE                
    JF[208] 0x6F   Oil level sensor error       x       Sensor error       JF                
What error is this referring to?[209] malfunction of inverter system, such as shortage of power supply capacity, defective power transistor, anor defective outdoor unit PCB L0[210] 0x70   Malfunction of inverter system-VRV II obsolete unit •Malfunction of inverter system.
•Shortage of power supply capacity.
•Defect of inverter PCB.
•Defect of power transistor.
•Unit would be the VRV II -Inverter compressor or the R! resistor across the contactor 81- Per the Daikin service application.   x       System error Condensing Unit (VRV)                 L0    
    L1[211] 0x71   Faulty Compressor Compartment PC Board/Malfunction of inverter PCB •Faulty compressor compartment PC board (A1P).
•IPM failure.
•Current sensor failure.
•MP-PAM failure.
•Failure of IGBT or drive circuit.
•Refer to Altherma Check 9.   x   REYQ-T   System error Condensing Unit (SkyAir,VRV), Altherma MonoBloc                 L1    
    L1[212]   01 IPM error: Compressor M1C (Master) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[213]   02 Defective current sensor 1: Compressor M1C
(Master)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[214]   03 Defective current sensor 2: Compressor M1C
(Master)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[215]   04 IGBT error: Compressor M1C (Master) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[216]   05 Jumper settings Inverter - Inverter compressor 1 – Master unit •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[217]   07 IPM error: Compressor M1C (Slave 1) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[218]   08 Defective current sensor 1: Compressor M1C
(Slave 1)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[219]   09 Defective current sensor 2: Compressor M1C
(Slave 1)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[220]   10 IGBT error: Compressor M1C (Slave 1) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[221]   11 IPM error: Compressor M1C (Slave 2) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[222]   12 Defective current sensor 1: Compressor M1C
(Slave 2)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[223]   13 Defective current sensor 2: Compressor M1C
(Slave 2)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[224]   14 IGBT error: Compressor M1C (Slave 2) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[225]   15 Jumper settings error (Slave 1) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[226]   16 Jumper settings error (Slave 2) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[227]   17 Instantaneous overcurrent - Inverter compressor 2 – Master unit •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[228]   18 Defective current sensor - Inverter compressor 2 – Master unit •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[229]   19 Current offset - Inverter compressor 2 – Master unit •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[230]   20 Defective power transistors - Inverter compressor 2 – Master unit •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[231]   21 Jumper settings Inverter - Inverter compressor 2 – Master unit •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[232]   22 Instantaneous overcurrent - Inverter compressor 2 – Slave unit 1 •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[233]   23 Defective current sensor - Inverter compressor 2 – Slave unit 1 •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[234]   24 Current offset - Inverter compressor 2 – Slave unit 1 •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[235]   25 Defective power transistors - Inverter compressor 2 – Slave unit 1 •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[236]   26 Jumper settings inverter - Inverter compressor 2 – Slave unit 1 •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[237]   28 Defective fan PCB EEPROM: Fan M1F (Master) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[238]   29 Defective fan PCB EEPROM: Fan M2F (Master) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[239]   32 Defective fan PCB EEPROM: Fan M1F (Slave 1) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[240]   33 Defective fan PCB EEPROM: Fan M2F (Slave 1) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[241]   34 Defective fan PCB EEPROM: Fan M1F (Slave 2) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[242]   35 Defective fan PCB EEPROM: Fan M2F (Slave 2) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[243]   36 Defective inverter PCB EEPROM: Compressor
M1C (Master)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[244]   37 Defective inverter PCB EEPROM: Compressor
M2C (Master)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[245]   38 Defective inverter PCB EEPROM: Compressor
M1C (Slave 1) 
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[246]   39 Defective inverter PCB EEPROM: Compressor
M2C (Slave 1) 
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[247]   40  Defective inverter PCB EEPROM: Compressor
M1C (Slave 2)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[248]   41  Defective inverter PCB EEPROM: Compressor
M2C (Slave 2)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[249]   46 DIP switch settings error (Slave 2)  •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[250]   47 15 V power supply error: Compressor M1C
(Master)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[251]   48 16 V power supply error: Compressor M2C
(Master)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[252]   49 15 V power supply error: Compressor M1C
(Slave 1)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[253]   50 16 V power supply error: Compressor M2C
(Slave 1)
•Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x       System error VRV IV                      
    L1[254]   51 15 V power supply error: Compressor M1C (Slave 2) •Inverter PCB.
•IPM failure.
•Current sensor failure.
•Drive circuit failure.
•Refer to Power Transistor Check 4.   x