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Error code causes and solutions. – part 3
Error code
(Hexadecimal)
Description
Cause
Required action
The air heat exchanger is dirty (cooling mode)
Clean the air heat exchanger.
The water heat exchanger is dirty (heating mode)
Clean the water heat exchanger (chemical cleaning).
Overcharge of refrigerant after maintenance
Charge unit to specified refrigerant amount.
Discharge gas thermistor error value
Repair wiring / change thermistor.
Equalizer valve error
Same as "Equalizer valve error"
Refrigerant leak
Repair leaks and charge refrigerant.
Expansion valve error
Replace expansion valve.
Water temperature increased/decreased rapidly (cooling
mode).
Same as "Low Water [T] Cutout"
Sharp fluctuation in flow rate
Same as "Low flow cutout"
Suction gas thermistor error value
Repair wiring / change thermistor.
Insufficient antifreeze concentration.
Replenish antifreeze
Refrigerant leak
Repair leaks and charge refrigerant.
High-pressure sensor error value
Repair wiring / change sensor.
Load fluctuations are too large
Reduce fluctuations
Outside air temperature is outside the specified working
range.
Operate the unit within the specified working range.
The chilled (warm) water temperature is outside the
working range.
Operate the unit within the specified working range.
The power supply's voltage or frequency is outside the
specified working range.
Operate the unit within the specified working range.
Strong wind
Install windbreak and window baffle.
Short circuit
Remove cause of short circuit.
Compressor fault
Replace the compressor.
Incorrect or loose wiring on the IPDU board of the
compressor terminal
Repair the wiring.
Incorrect wiring or loose wiring of the compressor
terminal
Repair the wiring.
The power supply (voltage, frequency) is outside the
working range.
Operate the unit within the working range.
Open circuit in control wiring, loose terminal
Repair the control wiring.
Expansion valve error
Replace expansion valve.
Open circuit condition or loose connection in control
wiring.
Repair the control wiring.
Suction gas thermistor error value
Repair wiring / change thermistor.
Coil gas thermistor error value (heat pump only)
Repair wiring / change thermistor.
Low-pressure sensor error value
Repair wiring / change sensor.
EEV board error
Replace EEV board.
72
Exp. valve2 abnormal
Same as "Exp. valve1 abnormal"
Same as "Exp. valve1 abnormal"
Four-way valve main unit error
Replace four-way valve main unit.
Four-way valve coil error
Replace four-way valve coil.
Open circuit condition or loose connection in control
wiring.
Repair the control wiring.
Thermistor error value (discharge, suction, coil)
Repair wiring / change thermistor.
EEV board error
Replace EEV board.
Outside air temperature is outside the specified working
range.
Operate the unit within the specified working range.
Equalizer valve main unit error
Replace equalizer valve main unit.
Equalizer valve coil error
Replace equalizer valve coil.
Open circuit condition or loose connection in control
wiring.
Repair the control wiring.
High-pressure and low-pressure sensor error value
Repair wiring / change sensor.
EEV board error
Replace EEV board.
Injection 2-way valve body or coil fault
Replace the injection 2-way valve body or coil.
Injection expansion valve body or coil fault
Replace the injection 2-way expansion valve or coil.
EEV board fault
Replace the EEV board.
Open circuit in control wiring, loose terminal
Repair the control wiring.
Clogged strainer
Replace the strainer.
Check valve operation fault
Replace the check valve.
Cooling fan fault
Replace cooling fan.
Open circuit condition or loose connection in control
wiring.
Repair the control wiring.
Heat sink sensor error value
Repair wiring / change sensor.
EEV board error
Replace EEV board.
Ventilation path obstructed.
Clear ventilation path.
Compressor error
Replace compressor.
Compressor PWM board error
Replace PWM board.
Compressor drive module error
Replace compressor drive module.
The power supply's voltage or frequency is outside the
specified working range.
Operate the unit within the specified working range.
Open circuit condition or loose connection in control
wiring.
Repair the control wiring.
74
Equalize valve error
Comp. out of range
4way valve abnormal
(Note 2)
73
67
Compressor unstarted failure
A0
COMP IGBT short
75
Refrig injection line failure
Cooling fan abnormal
7A
Abnormal DGT
63
(continued)
66
64
Exp. valve1 abnormal
71
65
Refrigerant shortage
Abnormal SGT