Climate Talk Fault Code Dealer error message Possible causes Corrective actions Alarm status Unit Type 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 EEV system error
d0 EEV Data not on network •No shared data on the network. •Populate shared data set using memory card. Critical EEV  system error
d4 EEV Invalid memory card data •Wrong memory card data. •Replace circuit board.
•Rewrite data using the correct memory card.
Critical EEV  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 EEV 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 EEV 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 EEV 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 EEV  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 system troubleshooting in installation manual.
•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 EEV  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 EEV  Communication error