Daikin One+ Unitary Error Codes

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EEV Coil
Climate Talk Fault Code Dealer error message Possible causes Corrective actions Alarm status Consumer error message
70 EEV open circuit( incorrect wiring or not connected) • Indoor EEV coil not connected.
• Incorrect wiring to EEV.
• Check indoor EEV coil connection (PCB and junction connector).
• Replace EEV coil.
• Check the resistance value of EEV coil (refer to service manual).
• Replace the control board.
Critical System error
d0 EEV Data not on network No shared data on the network. Populate shared data set using memory card. Critical System error
d4 EEV Invalid memory card data Wrong memory card data. • Replace circuit board.
• Rewrite data using the correct memory card.
Critical System error
73 Liquid side temperature fault • Open or short circuit of the liquid thermistor (X5A).
• Liquid thermistor reading incorrect values or values outside the normal range.
• Check the connection to liquid thermistor (PCB and junction connector).
• Check the resistance value of the thermistor (refer to service manual).
• Replace thermistor
• Replace the control board.
Critical Sensor error
74 Gas side temperature fault • Open or short circuit of the gas thermistor (X5A).
• Gas thermistor reading incorrect values or values outside the normal range.
• Check the connection to gas thermistor (PCB and junction connector).
• Check the resistance value of the thermistor (refer to service manual).
• Replace thermistor.
• Replace the control board.
Critical Sensor error
75 Pressure sensor fault • Open or short circuit of the pressure sensor (X15A).
• Pressure sensor reading incorrect values or values outside the normal range.
• Check the connection to pressure sensor (PCB and junction connector).
• Check the output voltage of the pressure sensor (refer to service manual).
• Replace pressure sensor.
• Replace the control board.
Critical Pressure error
76 Equipment communication loss during operation • Open communication circuit.
• Incorrect wiring between outdoor unit, gas furnace, or modular blower.
• No power supply to outdoor unit, gas furnace, or modular blower.
• Check for cased coil and other unit wiring.
• Replace the control board.
• Check the power supply to outdoor unit, gas furnace, or modular blower.
Critical Communication error
77 Thermostat communication loss during startup & operation • Incorrect wiring between indoor unit and thermostat.
The system may have the communication error without error code 77 on the indoor PCB. Follow section 16.6 SYSTEM TROUBLESHOOTING.
• Thermostat failure.
• Power interruption (low voltage).
• Check for thermostat and indoor unit wiring.
• Verify the input voltage at the indoor unit and thermostat.
After recovering the system with power supply, TSTAT ID NO COM will continue to be displayed on the thermostat for 2 minutes. The error code will be cleared automatically.
• Replace control board or thermostat.
• Press "LEARN" button on PCB for more than 5 seconds to reestablish network.
Critical Communication error
78 Equipment communication loss during startup • Open communication circuit.
• Incorrect wiring between outdoor unit, gas furnace, or modular blower.
• No power supply to outdoor unit, gas furnace, or modular blower.
• Check for cased coil and other unit wiring.
• Replace the control board.
• Check the power supply to outdoor unit, gas furnace, or modular blower.
Critical Communication error
AHU (indoor)
Climate Talk Fault Code Dealer error message Possible causes Corrective actions Alarm status Consumer error message
b0 Blower motor not running. • Loose wiring connection at circulator motor power leads or circulator motor power leads disconnected.
• Failed circulator blower motor.
• Tighten or correct wiring connection.
• Check circulator blower motor. Replace if necessary.
Critical Fan Failure error
b1 Blower motor communication error. • Loose wiring connection at circulator motor control leads.
• Failed circulator blower motor.
• Failed integrated control module.
• Tighten or correct wiring connection.
• Check circulator blower motor. Replace if necessary.
• Check integrated control module. Replace if necessary.
Critical Fan Failure error
b2 Blower motor horse power mismatch. • Incorrect circulator blower motor in air handler blower.
• Incorrect shared data set in integrated control module.
• Verify circulator blower motor horsepower is the same specified for the specific air handler blower model. Replace if necessary.
• Verify shared data set is correct for the specific model. Re-populate data using correct memory card if required.
Critical Fan Failure error
b3 Blower motor is operating in a power, temperature, or speed limiting condition. • Fan/motor obstruction or blocked filters.
• Power interruption (low voltage).
• Incorrect Wiring.
• Blockage in the airflow (ductwork) or ductwork undersized.
• Check for obstruction on the fan/motor/ductwork, clean filters.
• Verify the input voltage at the motor.
• Check wiring.
• Replace motor.
Minor Fan Failure error
b3 Blower motor is operating in a power, temperature, or speed limiting condition. • Blocked filters.
• Restrictive ductwork.
• Undersized ductwork.
• High ambient temperatures.
• Check filters for blockage. Clean filters or remove obstruction.
• Check ductwork for blockage. Remove obstruction. Verify all registers are fully open.
• Verify ductwork is appropriately sized for system. Resize/replace ductwork if necessary.
• See "Installation Instructions" for installation requirements.
Critical Fan Failure error
b4 Blower motor current trip or lost rotor position. • Abnormal motor loading, sudden change in speed or torque, sudden blockage of air handler blower/coil air inlet or outlet.
• High loading conditions, blocked filters, very restrictive ductwork, blockage of air handler blower/coil air inlet or outlet.
Check filters, filter grills/registers, duct system, and air handler blower/coil air inlet/outlet for blockages. Critical Fan Failure error
b5 Blower motor locked rotor. • Obstruction in circulator blower housing.
• Seized circulator blower motor bearings.
• Failed circulator blower motor.
• Check circulator blower for obstructions. Remove and repair/replace wheel/motor if necessary.
• Check circulator blower motor shaft rotation and motor. Replace if necessary.
Critical Fan Failure error
b6 Blower motor voltage or temperature trip. • High AC line voltage to air handler blower.
• Low AC line voltage to air handler blower.
• High ambient temperatures.
• Check power to air handler blower. Verify line voltage to blower is within the range specified on the air handler blower rating plate.
• See "Installation Instructions" for installation requirements.
Critical Fan Failure error
b7 ID blower motor does not have the required parameters to function. • Error with integrated control module.
• Motor has locked rotor condition.
• Check integrated control module. Verify control is populated with correct shared data set. See data errors above for details.
• Check for locked rotor condition (see error code above for details).
Critical Fan Failure error
b9 Low indoor airflow (without electric heat mode). • Blocked filters.
• Restrictive ductwork.
• Undersized ductwork.
• Check filters for blockage. Clean filters or remove obstruction.
• Check ductwork for blockage. Remove obstruction. Verify all registers are fully open.
• Verify ductwork is appropriately sized for system. Resize/replace ductwork if necessary.
Minor Fan Failure error
d0 No shared data on network. Air handler blower does not contain any shared data. Populate shared data set using memory card. Critical Fan Failure error
d1 Incorrect shared data on network. Air handler blower does not contain an appropriate shared data set. Populate correct shared data set using memory card. Critical System error
Eb Heater kit called when no heater kit (fan may blow cold air). No heater kit selected. • Select the valid heater kit on thermostat.
• Valid dip switch selection (heater kit selection out of range of the unit configuration).
Minor System error
Ed Heater kit dip switches not set correctly. Invalid heater kit selected. Set correct dip switches. Critical System error
EC Heater kit is too small or mismatched. • Heater kit selected via dipswitches is too small for heater kits in shared data set.
• Heater kit selected via dipswitches doesn't match heater kits in shared data set.
• Verify electric heat dipswitch settings.
• Verify the installed electric heater is valid for the air handler blower. Check nameplate or Specification Sheet applicable to your model* for allowable heater kit(s).
• Verify shared data set is correct for the specific model. Re-populate data using correct memory card if required.
Minor System error
EC Heater kit selected is too large. Heater kit selected via dipswitches is too large for heater kits in shared data set. • Verify electric heat dipswitch settings.
• Verify the installed electric heater is valid for the air handler blower. Check nameplate or Specification Sheet applicable to your model* for allowable heater kit(s).
• Verify shared data set is correct for the specific model. Re-populate data using correct memory card if required.
Minor System error
EE Internal fault (incorrect PCB operation). • Manual disconnect switch OFF or 24 volt wire improperly connected or loose.
• Blown fuse or circuit breaker.
• Integrated control module has an internal fault.
• Assure 208/230 volt and 24 volt power to air handler blower and integrated control module.
• Check integrated control module fuse (3A). Replace if necessary.
• Check for possible shorts in 208/230 volt and 24 volt circuits. Repair as necessary.
• Replace bad integrated control module.
Critical System error
EF Auxiliary contacts open. High water level in the evaporation coil. Check overflow pan and service. Critical System error
E5 Blown fuse on PCB. • Fuse (F1U) is blown.
• Connector TB10 is open.
• Replace fuse.
• Check wiring to AUX alarm, heater kit, communication connection.
Critical System error
9b Low indoor airflow (with electric heat mode). • Fan/motor obstruction or blocked filters.
• Restrictive ductwork or ductwork undersized.
• ID motor failure.
• Combination mistake outdoor unit and indoor unit.
• Check for obstruction on the fan/motor.
• Check ductwork/filter for blockage, clean filters.
• Remove obstruction. Verify all registers are fully open.
• Check the connections and the rotation of the motor.
• Verify the input voltage at the motor.
• Verify ductwork is appropriately sized for system. Resize/replace ductwork if needed.
• Replace motor
Critical System error
77 Thermostat communication loss during startup & operation. • Incorrect wiring between ID unit and thermostat.
• Thermostat failure.
• Power interruption (low voltage).
• Check for thermostat and indoor unit wiring.
• Verify the input voltage of the pressure sensor (refer to service manual).
• Replace pressure sensor.
• Replace the control board.
Critical Communication error
70 EEV open circuit( incorrect wiring or not connected). • Indoor EEV coil not connected.
• Incorrect wiring to EEV.
• Check indoor EEV coil connection (PCB and junction connector).
• Replace EEV coil.
• Check the resistance value of EEV coil (refer to service manual).
• Replace the control board.
Critical System error
73 Liquid side temperature fault. • Open (or) short circuit of the liquid thermistor (X5A).
• Liquid thermistor reading incorrect or values outside normal range.
• Check the connection to the liquid thermistor (PCB and junction connector).
• Check the resistance value of the thermistor (refer to service manual).
• Replace thermistor.
• Replace the control board.
Critical Sensor error
74 Gas side temperature fault. • Open (or) short circuit of the gas thermistor (X5A).
• Gas thermistor reading incorrect or values outside normal range.
• Check the connection to the liquid thermistor (PCB and junction connector).
• Check the resistance value of the thermistor (refer to service manual).
• Replace thermistor.
• Replace the control board.
Critical Sensor error
75 Pressure sensor fault. • Open (or) short circuit of the pressure sensor (X15A).
• Pressure sensor reading incorrect or values outside normal range.
• Check the connection to pressure sensor (PCB and junction connector).
• Check the output voltage of the pressure sensor (refer to service manual).
• Replace pressure sensor.
• Replace the control board.
Critical Pressure error
Furnace (indoor)
Climate Talk Fault Code Dealer error message Possible causes Corrective actions Alarm status Consumer error message
b0 Blower motor not running • Loose wiring connection at circulator motor power leads or circulator power leads disconnected.
• Open circuit in inductor or loose wiring connection at inductor(3/4 Hp & 1 Hp models only).
• Failed circulator blower motor.
• Tighten or correct wiring connection
• Verify continuous circuit through inductor. Replace if open or short circuit.
• Check circulator blower motor. Replace if necessary.
Critical Fan Failure
b1 Blower communication error • Loose wiring connection at circulator motor control leads.
• Failed circulator blower motor.
• Failed integrated control module.
• Tighten or correct wiring connection.
• Check circulator blower motor. Replace if necessary.
• Check circulator integrated control module. Replace if necessary
Critical Communication
b2 Blower motor HP mismatch • Incorrect circulator blower motor in furnace.
• Incorrect shared data set in integrated control module.
• Verify circulator blower if motor horse power is the same specified for the specific furnace model. Replace if necessary.
• Verify shared data set is correct for the specific model. Re-populate data using correct memory card if required.
Critical Fan Failure
b3 Blower motor is operating in a power, temperature, or speed limiting condition • Blocked filters.
• Restrictive ductwork.
• Undersized ductwork.
• High ambient temperatures.
• Check filters for blockage. Clean filters or remove obstructions.
• Check ductwork for blockage. Remove obstruction. Verify all registers are fully open.
• Verify ductwork is appropriately sized for system. Resize/replace ductwork if necessary.
• See "Product description" and "Location Requirements & Considerations" for furnace installation requirements.
Minor Fan Failure
b4 Blower motor current trip or lost rotor position Abnormal motor loading, sudden change in speed or torque, sudden blockage of furnace air inlet or outlet. Check filters, filter grills/registers, duct system, and furnace air inlet/outlet for blockages. Critical Fan Failure
b5 Blower motor locked rotor • Obstruction in circulator blowing housing
• Seized circular blower motor bearings
• Failed circular blower motor
• Check circulator blower for obstructions. Remove and repair/replace wheel/motor if necessary.
• Check circular blower motor shaft rotation and motor. Replace motor if necessary.
Critical Fan Failure
b6 Voltage or temperature trip • High AC line voltage to furnace
• Low AC line voltage to furnace
• High ambient temperatures
• Check power to furnace. Verify line voltage to furnace is within the range specified on the furnace rating plate.
• See "III. Product Description" and "IV. Location Requirements & Considerations" furnace installation requirements.
Critical Fan Failure
b7 Incomplete parameters sent to motor • Error with integrated control module
• Motor has a locked rotor condition
• Check integrated control module. Verify control is populated with correct shared data set. See data errors above for details.
• Check for locked rotor condition (see error code above for details).
Critical Fan Failure Error
b9 Low indoor airflow • Blocked filters
• Restrictive ductwork
• Undersized ductwork
• Check filter for blockage. Clean filters or remove obstructions.
• Check ductwork for blockage. Remove obstructions. Verify all registers are fully open.
• Verity ductwork is appropriately sized for system. Resize/replace ductwork if necessary
Critical Fan Failure
d0 Data not yet on network Furnace does not contain any shared data Populate shared data set using memory card Critical Communication error
d1 Invalid data on network Air conditioner is wired as part of a communicating system and integrated control module does contain any shared data Replace control board if necessary Critical Communication error
d4 Invalid memory card data Shared data set on memory card has been rejected by integrated control module Verify shared data set is correct for the specific model. Re-populate data using correct memory card is required. Critical Communication error
E0 Lockout due to excessive ignition attempts • Failure to establish flame. Cause may be no gas to burners, front cover pressure switch stuck open, bad igniter or igniter alignment, improper orifices, or coated/oxidized or improperly connected flame sensor.
• Loss of flame after establishment. Cause may be interrupted gas supply, lazy burner flames (improper gas pressure or restriction in fuel and/or combustion air piping), front cover pressure switch opening, or improper induced draft blower performance.
• Locate and correct gas interruption.
• Check front cover pressure switch operation (hose, wiring, contact operation). Correct if necessary.
• Replace or realign igniter.
• Check flame sensor signal. Clean sensor if coated and/or oxidized.
• Check fuel piping for blockage, proper length, elbows, and termination.
• Verify proper induced draft blower performance.
Critical Safety error
E1 Low stage pressure switch closed at start of heating • Low stage pressure switch contacts sticking.
• Shorts in pressure switch circuit wiring.
• Preplace low stage pressure switch.
• Repair short in wiring.
Critical Pressure error
E2 Low stage pressure switch open during heating • Pressure switch hose blocked, pinched, or connected improperly.
• Blocked flue and/or inlet air pipe, blocked drain system or weak induced draft blower.
• Incorrect pressure switch set point or malfunctioning switch contacts.
• Loose or improperly connected wiring.
• Inspect pressure switch hose. Repair/replace if necessary.
• Inspect flue and/or inlet air piping for blockage, proper length, elbows, and termination. Check drain system. Correct as necessary.
• Correct pressure switch set point or contact motion.
• Tighten or correct wiring connection.
Critical Pressure error
E3 Open high limit switch • Insufficient conditioned air over the heat exchanger. Blocked filters, restrictive ductwork, improper circulator blower speed, or failed circulator blower motor.
• Flame rollout.
• Misaligned burners, blocked fuel and/or air inlet pipe, or failed induced draft blower.
• Loose or improperly connected wiring.
• Check filters and ductwork for blockage. Clean filters or remove obstruction.
• Check circulator blower speed and performance. Correct speed or replace blower motor if necessary.
• Check burners for proper alignment.
• Check fuel and air inlet piping for blockage, proper length, elbows, and termination. Correct if necessary.
• Check induced draft blower for proper performance. Replace if necessary.
•Tighten or correct wiring connection.
Critical Pressure error
E5 Blown fuse on PCB Short in low voltage wiring. Locate and correct short in low voltage wiring. Critical System error
E6 Low flame signal • Flame sensor is coated/oxidized.
• Flame sensor incorrectly positioned in burner flame.
• Lazy burner flame due to improper gas pressure or combustion sir.
• Clean flame sensor if coated/oxidized.
• Check inlet air piping for blockage, proper length, elbows. And termination.
• Compare current gas pressure to rating plate. Adjust if needed.
• Inspect for proper sensor alignment.
Critical System error
E7 Igniter fault or improper grounding • Improperly connected igniter.
• Shorted igniter.
• Poor unit ground.
• Igniter relay fault on integrated control module.
• Check and connect wiring from integrated control module to igniter.
• Replace shorted igniter.
• Check & correct unit ground wiring.
• Check igniter output from control. Replace if necessary.
Critical System error
E8 High stage pressure switch stuck closed • High stage pressure switch contacts sticking.
• Shorts in pressure switch circuit wiring.
• Replace high stage pressure switch.
• Repair short in wiring.
Critical Pressure error
E9 High stage pressure switch stuck open • Pressure switch hose blocked, pinched, or connected improperly.
• Blocked flue and/or inlet air pipe, blocked drain system or weak induced draft blower.
• Incorrect pressure switch set point or malfunctioning switch contacts.
• Loose or improperly connected wiring.
• Inspect pressure switch hose. Repair/replace if necessary.
• Inspect flue and/or inlet air piping for blockage, proper length, elbows, and termination. Check drain system. Correct as necessary.
• Correct pressure switch set point or contact motion.
• Tighten or correct wiring connection.
Critical Pressure error
EA Reversed 115VAC polarity • Polarity of 115 volt AC power to furnace or integrated module is reversed.
• Poor unit ground.
• Review wiring diagram to correct polarity.
• Verify proper ground. Correct if necessary.
• Check and correct wiring.
Critical Safety error
EC Inducer motor current fault Lingering Inducer motor overcurrent detected. • Reset system power and verify inducer is running properly.
• Replace inducer or integrated control module, if necessary.
Critical Safety error
ED Flame rollout switch is open • Orifice plate out of position.
• Blocked heat exchanger.
• Burners out of alignment.
• Defective heat exchanger.
• Line up orifice plate.
• Remove blockage from heat exchanger.
• Line up burners.
• Check for flame disturbance on roll out when burner comes on.
Critical Safety error
EF Auxiliary input open High water level in the evaporation coil. Check overflow pan and service. Critical System error
AC_HP Unitary (outdoor)
Climate Talk Fault Code Dealer error message Possible causes Corrective actions Alarm status Consumer error message
01 Low pressure switch is open, continuous current detected, or 4 consecutive protector trips • Low refrigerant charge.
• Restriction in liquid line.
• Indoor blower motor failure.
• Indoor thermostat set extremely low.
• Verify refrigerant charge; adjust as needed.
• Check for restricted liquid line; repair/replace as needed.
• Check indoor blower motor; repair/replace as needed.
• Check indoor thermostat setting.
Minor Pressure error
01 Lockout after 3 consecutive low pressure switch trips • Low refrigerant charge.
• Restriction in liquid line.
• Indoor blower motor failure.
• Indoor thermostat set extremely low.
• Verify refrigerant charge; adjust as needed.
• Check for restricted liquid line; repair/replace as needed.
• Check indoor blower motor; repair/replace as needed.
• Check low pressure switch; repair/replace as needed.
• Check indoor thermostat setting.
Critical Pressure error
02 HPS is open, or 4 consecutive protector trips • Blocked condenser coil.
• Outdoor fan not running.
• Check and clean condenser coil.
• Check outdoor fan motor; repair/replace as needed.
• Check outdoor fan motor wiring; repair/replace as needed.
• Check outdoor fan motor capacitor; repair/replace as needed.
Minor Pressure error
02 Lockout after detecting 3 consecutive HPS trips • Blocked condenser coil.
• Outdoor fan not running.
• Check and clean condenser coil.
• Check outdoor fan motor; repair/replace as needed.
• Check outdoor fan motor wiring; repair/replace as needed.
• Check outdoor fan motor capacitor; repair/replace as needed.
Critical Pressure error
03 Compressor short cycling • Intermittent thermostat demand.
• Faulty compressor relay.
• heck thermostat and thermostat wiring; repair/replace as needed.
• Check compressor relay operation; replace as needed.
Minor System error
04 Locked rotor • Compressor bearings are seized.
• Failed compressor run capacitor.
• Faulty run capacitor wiring.
• Low line voltage.
• Check compressor operation; repair/replace as needed.
• Check run capacitor; replace as needed.
• Check wiring; repair/replace as needed.
• Verify line voltage is within range on rating plate; contact local utility if out of range.
Critical System error
05 Open circuit • Power is disconnected.
• Failed compressor protector.
• Compressor not properly wired to control.
• Check circuit breaker and fuses.
• Check wiring to unit; repair/replace as needed.
• Check compressor; repair/replace as needed.
• Check compressor wiring; repair/replace as needed.
Critical System error
06 Open start circuit • Compressor start winding is open.
• Failed compressor run capacitor.
• Faulty run capacitor wiring.
• Compressor not properly wired to control.
• Faulty compressor wiring.
• Check compressor; repair/replace as needed.
• Check run capacitor; replace as needed.
• Check wiring; repair/replace as needed.
Critical System error
07 Lock out after 5 consecutive compressor starts • Compressor run winding is open.
• Compressor not properly wired to control.
• Faulty compressor wiring.
• Check compressor; repair/replace as needed.
• Check wiring; repair/replace as needed.
Critical System error
08 High/Low power supply voltage condition Low line voltage. • Check circuit breakers and fuses; Replace if needed.
• Verify unit is connected to power supply as specified on rating plate.
• Correct low line voltage condition; contact local utility if needed.
Minor System error
08 High/Low power supply voltage condition High line voltage. • Correct high line voltage condition; contact local utility if needed.
• Verify unit is connected to power supply as specified on rating place.
Critical System error
09 Secondary low-voltage error • Control detects secondary voltage less than 18 VAC.
• Transformer overloaded.
• Low line voltage.
• Check fuse.
• Correct low secondary voltage condition.
• Check transformer; replace if needed.
Minor System error
11 System Test required for start up • Incomplete SYSTEM TEST.
• SYSTEM TEST is running.
Message only Critical System error
12 General memory error • High electrical noise.
• Faulty control board.
Replace control board if necessary. Critical System error
13 Experiencing frequent high pressure faults • Blocked/restricted condenser coil and /or lines.
• Stop valve not completely open.
• Overcharged.
• Outdoor fan not running.
• High pressure switch (HPS) inoperable.
• Faulty indoor EEV or TXV.
• Faulty indoor EEV coil.
• Faulty control board.
• DV**PEC air handler is connected with DX20VC0**1AA or AB.
• Check and clean condenser coil and/or lines.
• Check the opening of stop valve, should be fully open; Repair/replace if needed.
• Check refrigerant charge level; Adjust if needed.
• Check outdoor fan motor & wiring; Repair/replace if needed.
• Check indoor EEV or TXV; Replace if needed.
• Check indoor EEV coil; Replace if needed.
• Replace control board if necessary.
• Replace indoor unit with TXV applicable indoor unit.
Critical Pressure error
14 Experiencing frequent high pressure faults but acceptable to run • Blocked/restricted condenser coil and/or lines.
• Stop valve not completely open.
• Overcharged.
• Outdoor fan not running.
• High pressure switch (HPS) inoperable.
• Faulty indoor EEV or TXV.
• Faulty indoor EEV coil.
• Faulty control board.
• DV**PEC air handler is connected with an incompatible model.
• Check and clean condenser coil and/or lines.
• Check the opening of stop valve, should be fully open; Repair/replace if needed.
• Check refrigerant charge level; Adjust if needed.
• Check outdoor fan motor & wiring; Repair/replace if needed.
• Check indoor EEV or TXV; Replace if needed.
• Check indoor EEV coil; Replace if needed.
• Replace control board if necessary.
• Check high pressure switch; Replace if necessary.
• Replace indoor unit with TXV applicable indoor unit.
Minor Pressure error
15 Frequent low pressure faults • Stop valve not completely open.
• Restriction in refrigerant lines.
• Low refrigerant charge.
• Refrigerant leak.
• Low pressure sensor inoperable or not properly connected.
• Indoor fan motor not functioning correctly.
• Faulty indoor EEV or TXV.
• Faulty indoor EEV coil.
• Faulty Control board
• DV**PEC air handler is connected with an incompatible model.
• Check the opening of stop valve, should be fully open; Repair/replace if needed.
• Check for restrictions in refrigerant line; Repair/replace if needed.
• Check refrigerant charge level; Adjust if needed.
• Test for system leaks using leak test procedure.
• Check the connection to low pressure sensor; Repair/replace if needed.
• Check indoor EEV or TXV; Replace if needed.
• Check indoor EEV coil; Replace if needed.
• Check indoor blower motor & wiring; Repair/replace if needed.
• Replace control board if necessary.
• Replace indoor unit with TXV applicable indoor unit.
Critical Pressure error
16 Frequent low pressure faults • Stop valve not completely open.
• Restriction in refrigerant lines.
• Low refrigerant charge.
• Refrigerant leak.
• Low pressure sensor inoperable or not properly connected.
• Indoor fan motor not functioning correctly.
• Faulty indoor EEV or TXV.
• Faulty indoor EEV coil.
• Faulty Control board
• DV**PEC air handler is connected with an incompatible model.
• Check the opening of stop valve, should be fully open; Repair/replace if needed.
• Check for restrictions in refrigerant line; Repair/replace if needed.
• Check refrigerant charge level; Adjust if needed.
• Test for system leaks using leak test procedure.
• Check the connection to low pressure sensor; Repair/replace if needed.
• Check indoor EEV or TXV; Replace if needed.
• Check indoor EEV coil; Replace if needed.
• Check indoor blower motor & wiring; Repair/
replace if needed.
• Replace control board if necessary. • Replace indoor unit with TXV applicable indoor unit.
Critical Pressure error
17 Frequent compressor faults • Stop valve not completely open.
• The compressor wire has lost phase.
• Compressor motor failure.
• Check the opening of stop valve, should be fully open; Repair/replace if needed.
• Check the wire between control board and compressor.
• Inspect compressor motor for proper function; Replace if necessary.
Critical System error
18 Outdoor control board error • Outdoor fan motor not connected properly.
• Faulty control board.
• Noise.
• Check wiring from outdoor fan motor to control board; Repair if needed.
• Replace control board if necessary.
Critical System error
19 Outdoor unit PCB or fan failure error • Obstruction in fan rotation.
• Outdoor fan motor not connected properly.
• Outdoor fan not running.
• Faulty control board.
• Noise.
• Check and clean grille of any debris.
• Check wiring from outdoor fan motor to control board; Repair if needed.
• Check outdoor fan motor & wiring; Repair/replace as needed.
• Replace control board if necessary.
Critical System error
20 EEV coil is not connected • Outdoor EEV coil is not connected.
• Faulty outdoor EEV coil.
Check outdoor EEV coil connection; Repair/replace as needed. Critical System error
21 Experiencing frequent low discharge superheat faults • Thermistors inoperable or improperly connected.
• Faulty indoor EEV coil.
• Faulty indoor EEV or TXV.
• Faulty outdoor EEV coil.
• Faulty outdoor EEV.
• Overcharged.
• Faulty pressure sensor.
• Faulty control board.
• DV**PEC air handler is connected with an incompatible model.
• Check the connection to thermistors; Repair/replace if needed.
• Check indoor EEV coil; Repair/replace if needed.
• Check indoor EEV or TXV; Repair/replace if needed.
• Check outdoor EEV coil; Repair/replace if needed.
• Check outdoor EEV; Repair/replace if needed.
• Check refrigerant charge level; Adjust if needed.
• Check pressure sensor; Repair/replace if needed.
• Replace control board if necessary.
• Replace indoor unit with TXV applicable indoor unit.
Critical Sensor error
22 Hi discharge temperature error • Discharge thermistor inoperable or improperly connected.
• Discharge thermistor is set to incorrect position or off.
• Low refrigerant charge.
• Overcharged.
• Faulty Compressor.
• Check discharge thermistor resistance and connections; Repair/replace as needed.
• Check discharge thermistor position.
• Check refrigerant charge level; Adjust if needed.
• Check the compressor; Repair/replace if needed.
Critical Sensor error
23 Discharge temperature sensor failure Discharge thermistor inoperable or improperly connected. Check discharge thermistor resistance and connections; Repair/replace as needed. Critical Sensor error
24 High pressure switch is open High pressure switch (HPS) inoperable. Check resistance on HPS to verify operation; Replace if needed. Critical Pressure error
25 Outdoor temperature sensor error Faulty or disconnected outdoor thermistor sensor. Inspect and test sensor; Replace sensor if needed. Critical Sensor error
26 Pressure sensor not reacting properly Low pressure sensor inoperable or not properly connected. Check the connection to low pressure sensor; Repair/replace as needed. Critical Pressure error
27 Outdoor defrost sensor error Outdoor defrost thermistor inoperable or not properly connected. Check the connection to outdoor defrost thermistor; Repair as needed. Critical Sensor error
28 Outdoor coil temperature sensor error Outdoor defrost thermistor inoperable or not properly connected. Check the connection to outdoor defrost thermistor; Repair as needed. Critical Sensor error
29 Liquid temperature sensor error Liquid thermistor inoperable or not properly connected. Check the connection to liquid thermistor; Repair/replace if needed. Critical Sensor error
30 Control board may need to be replaced • Wiring to control board disconnected.
• Faulty control board.
• Noise.
• Check wiring to control board; Repair as needed.
• Replace control board if necessary.
Critical Communication error
30 Control board may need to be replaced • Wiring to control board disconnected.
• Faulty control board.
• Noise.
• Check wiring to control board; Repair as needed.
• Replace control board if necessary.
Critical Communication error
31 High current leak • Improper ground.
• Faulty compressor.
• Check ground screws/lugs and wiring; Repair/replace if needed.
• Check the compressor. Repair/replace if needed.
Critical Safety error
32 Outdoor unit control board high temperature fault • Ambient air conditions too high.
• Cooling bracket screw(s) missing or not properly fastened (2-4 ton only).
• No or poor thermal grease coating between cooling plumbing and cooling bracket on control board (2-4 ton only).
• Outdoor fan low speed (5 ton only).
• No flow or limited flow through control board cooling circuit (potential restriction in line or low refrigerant) (2-4 ton only).
• Stop valve not completely open (2-4 ton only).
• Cycle power; retry during usable ambient temperature range.
• Verify cooling bracket screws in place and secure; Secure fasteners as needed (2-4 ton only).
• Check thermal grease inside cooling bracket on control board; Apply additional grease as needed.
• Check outdoor fan motor & wiring; Repair/replace if needed (5 ton only).
• Check for restriction in line.
• Check refrigerant charge level; Adjust if needed (2-4 ton only).
• Check the opening of stop valve, should be fully open; Repair/replace if needed (2-4 ton only).
Critical Sensor error
33 Outdoor unit control board high temperature fault but acceptable to run • Ambient air conditions too high.
• Cooling bracket screw(s) missing or not properly fastened (2-4 ton only).
• No or poor thermal grease coating between cooling plumbing and cooling bracket on control board (2-4 ton only).
• Outdoor fan low speed (5 ton only).
• No flow or limited flow through control board cooling circuit (potential restriction in line or low refrigerant) (2-4 ton only).
• Stop valve not completely open (2-4 ton only).
• Cycle power; retry during usable ambient temperature range.
• Verify cooling bracket screws in place and secure; Secure fasteners as needed (2-4 ton only).
• Check thermal grease inside cooling bracket on control board; Apply additional grease as needed.
• Check outdoor fan motor & wiring; Repair/replace if needed (5 ton only).
• Check for restriction in line.
• Check refrigerant charge level; Adjust if needed (2-4 ton only).
• Check the opening of stop valve, it should be fully open; Repair/replace if needed (2-4 ton only).
Minor Sensor error
34 Outdoor unit PCB detected a possible short circuit • Current spike in supply.
• Stop valve not completely open.
• The compressor wire has lost phase.
• Faulty control board.
• Faulty compressor.
• Check power supply for inrush current during start up or steady state operation.
• Check the opening of stop valve, should be fully open; Repair/replace if needed.
• Check the wire between control board and compressor.
• Replace control board if necessary.
• Check the compressor; Repair/replace if needed.
Critical Safety error
35 Outdoor unit PCB detected a high current condition • Short circuit condition.
• Stop valve not completely open.
• Overcharged.
• Faulty control board.
• Faulty compressor.
• Check installation clearances.
• Check the opening of stop valve, should be fully open; Repair/replace if needed.
• Check refrigerant charge level; Adjust if needed.
• Replace control board if necessary.
• Check the compressor; Repair/replace if needed.
Critical Safety error
36 Startup procedure error • Blocked/Restricted condenser coil and/or lines.
• The compressor wire has lost phase.
• Inconsistent compressor load.
• Faulty control board.
• Check and clean condenser coil and/or lines.
• Check the wiring between control board and compressor.
• Replace control board if necessary.
Critical System error
37 Control board error • Outdoor fan motor not connected properly.
• Faulty control board.
• Check wiring from outdoor fan motor to control board; Repair if needed.
• Replace control board if necessary.
Critical System error
38 Compressor voltage error • High or low voltage from supply.
• The compressor wire has lost phase.
• Faulty control board.
• Correct low/high line voltage condition; Contact local utility if needed.
• Check the wire between control board and compressor.
• Replace control board if necessary.
Critical System error
39 Control board may need to be replaced • Thermistors inoperable or improperly connected.
• Faulty control board.
• Check the connection to thermistors; Repair/replace if needed.
• Replace control board if necessary.
Critical System error
40 Compressor requirement is different than the compatibility • Memory card not correct.
• Control board mismatch.
• Check memory card data vs. air conditioner model.
• Verify control board size vs. air conditioner model; Replace control board if necessary.
Critical Communication error
41 Low refrigerant condition error • Refrigerant leak.
• Low refrigerant charge.
• Thermistors inoperable or not properly connected.
• Test for system leaks using leak test procedure.
• Check refrigerant charge level; Adjust if needed.
• Check the connection to the thermistor; Repair/replace if needed.
Critical System error
42 Low power supply voltage condition detected Low line voltage supply. • Check circuit breakers and fuses; Replace if needed. • Verify unit is connected to power supply as specified on rating plate. • Correct low line voltage condition; Contact local utility if needed. Critical Safety error
43 High power supply voltage condition detected High line voltage supply. • Verify unit is connected to power supply as specified on rating plate. • Correct high line voltage condition; Contact local utility if needed. Critical Safety error
43 High power supply voltage condition detected High line voltage supply. • Verify unit is connected to power supply as specified on rating plate. • Correct high line voltage condition; Contact local utility if needed. Critical Safety error
44 Recommended outdoor operational temperature is out of range Ambient air conditions too high or low. Cycle power; retry during usable ambient temperature range. Minor System error
45 Cooling mode test error Heat provided by secondary heating source. Turn off heater using thermostat before running AHRI mode. Critical System error
46 Unable to start heating mode test. Set thermostat to off position Heat provided by secondary heating source. Turn off heater using thermostat before running AHRI mode. Critical System error
47 Unable to start system verification test. Set thermostat to off position Heat provided by secondary heating source. Turn off heater using thermostat before operation. Critical System error
48 Unable to enter pump down mode. Set thermostat to off position Heat provided by secondary heating source. Turn off heater using thermostat before operation. Critical System error
49 Unable to enter charging mode. Set thermostat to off position Heat provided by secondary heating source. Turn off heater using thermostat before operation. Critical System error
49 Unable to enter charging mode. Set thermostat to off position Heat provided by secondary heating source. Turn off heater using thermostat before operation. Critical System error
50 Voltage issue on the control board. See manual for troubleshooting info • High or low voltage from supply.
• Faulty control board.
• Correct low/high line voltage condition; Contact local utility if needed.
• Replace control board if necessary.
Critical Safety error
51 Potential communication issues have been detected by the outdoor control board Communication wiring disconnected. Check communication wiring; Repair as needed. Critical Communication error
52 Experiencing frequent compressor faults but acceptable to run • Stop valve not completely open.
• The compressor wire has lost phase.
• Compressor motor failure.
• Check the opening of stop valve, should be fully open; Repair/replace if needed.
• Check the wire between control board and compressor.
• Inspect compressor motor for proper function; Replace if necessary.
Minor System error
53 Frequent outdoor faults • Obstruction in fan rotation.
• Outdoor fan motor not connected properly.
• Outdoor fan not running.
• Faulty control board.
• Noise.
• Check and clean grille of any debris.
• Check wiring from outdoor fan motor to control board; Repair if needed.
• Check outdoor fan motor & wiring; Repair/replace as needed.
• Replace control board if necessary.
Minor System error
54 Experiencing frequent low discharge superheat faults but acceptable to run • Thermistors inoperable or improperly connected.
• Faulty indoor EEV or TXV or indoor EEV coil.
• Faulty control board.
• DV**PEC air handler is connected with an incompatible model.
• Check and clean grille of any debris.
• Check wiring from outdoor fan motor to control board; Repair if needed.
• Check outdoor fan motor & wiring; Repair/replace as needed.
• Replace control board if necessary.
Minor Sensor error
55 Frequent low discharge superheat faults but acceptable to run • Discharge thermistor inoperable or improperly connected.
• Discharge thermistor is set to incorrect position or off.
• Low refrigerant charge.
• Overcharged.
• Faulty Compressor.
• Check and clean grille of any debris.
• Check wiring from outdoor fan motor to control board; Repair if needed.
• Check outdoor fan motor & wiring; Repair/replace as needed.
• Replace control board if necessary.
Minor Sensor error
57 The control is sensing sweating on the cooling loop. • Refrigerant leak.
• Low refrigerant charge.
• Faulty indoor EEV or TXV or indoor EEV coil.
• Thermistors inoperable or not properly connected.
• DV**PEC air handler is connected with an incompatible model.
• Test for system leaks using leak test procedure.
• Check refrigerant charge level; Adjust if needed.
• Check indoor EEV or TXV; Replace if needed.
• Check indoor EEV coil; Replace if needed.
• Check the connection to the thermistor; Repair/replace if needed.
• Replace indoor unit with TXV applicable indoor unit.
Minor System error
A2 Outdoor air temperature sensor error • Shorted sensor.
• Open sensor.
• Sensor disconnected.
• Sensor out of range.
• Check sensor connection.
• Replace open/shorted sensor.
Critical Sensor error
A3 Outdoor coil temperature sensor open or shorted • Shorted sensor.
• Open sensor.
• Sensor disconnected.
• Sensor out of range.
• Check sensor connection.
• Replace open/shorted sensor.
Critical Sensor error
B0 Blower motor not running when should • Failed indoor blower motor.
• Indoor fan motor not properly connected.
• Too much static pressure.
• Check indoor fan motor wiring and connectors; Repair/replace if needed.
• Check indoor fan motor; Replace if needed.
Critical Fan Failure error
B9 Minimum airflow error • Failed indoor blower motor.
• Indoor fan motor not properly connected.
• Too much static pressure.
• Check indoor fan motor wiring and connectors; Repair/replace if needed.
• Check indoor fan motor; Replace if needed.
Minor Fan Failure error
DO Control board lacks the necessary data to perform its functions Air conditioner is wired as part of a communicating system and integrated control module does not contain any shared data. • Replace control board if necessary.
• Rewrite shared data using memory card.
Critical Communication error
D1 Control board lacks appropriate data to perform its functions Air conditioner is wired as part of a communicating system and integrated control module contains invalid shared data or network data is invalid for the integrated control module • Replace control board if necessary
• Rewrite shared data using memory card
Critical Communication error
D2 The airflow requirement is greater than the airflow capability of the indoor subsystem • Air conditioner/heat pump is wired as part of a communicating system and outdoor unit requires airflow greater than indoor unit's airflow capability
• Shared data is incompatible with the system or missing parameters
• Verify system type (communicating or legacy)
• Verify shared data is correct for your specific model; repopulate data if required
• Wire system as legacy
Minor Communication error
D2 Incompatible shared data or missing parameters • Air conditioner/heat pump is wired as part of a communicating system and outdoor unit requires airflow greater than indoor unit's airflow capability
• Shared data is incompatible with the system or missing parameters
• Communication wiring has loose connection
• Verify shared data is correct for your specific model; Repopulate data if required
• Check communication wiring; Repair as needed
Critical Communication error
D3 There is a mismatch between the shared data and the control physical hardware Shared data sent to integrated control module does not match hardware configuration Verify shared data is correct for your specific model; Repopulate data if required Critical Communication error
D4 Memory card data has been rejected Shared data on memory card has been rejected Verify shared data is correct for your specific model; Repopulate data if required Critical Communication error
E5 Blown fuse on PCB Short in low voltage wiring Locate and correct short in low voltage wiring. Critical System error
EE Compressor relay contacts are welded shut. Compressor relay contacts welded Replace control Critical System error
56 Suction temperature sensor failure Suction thermistor inoperable or not properly connected • Check the connection to suction thermistor; Repair/replace if needed
• Check for obstruction inside duct work
Critical Sensor error