Climate Talk Fault Code Dealer error message Possible causes Corrective actions Unit Type Alarm status Consumer error message Alarm Category   Pressure  Alarms   Sensor Alarms   Safety  Alarms   Communication Alarms   System Alarms   Fan Failure Alarms
                                       
                                       
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.		 EEV Critical system error System                   70    
d0 EEV Data not on network •No shared data on the network. •Populate shared data set using memory card. EEV Critical  system error System               d0        
d4 EEV Invalid memory card data •Wrong memory card data. •Replace circuit board.
•Rewrite data using the correct memory card.		 EEV Critical  system error System                   d4    
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.		 EEV Critical Sensor error Sensor       73                
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.		 EEV Critical Sensor error Sensor       74                
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.		 EEV Critical Pressure error Pressure   75                    
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.		 EEV Critical  Communication error communication               76        
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.		 EEV Critical  Communication error communication               77        
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.		 EEV Critical  Communication error communication               78