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43
Compressor shell
temperature too high
protection
X
★
○
Compressor exhaust temperature sensor connection is loose
Unit does not have enough refrigerant
Anti-freeze protection
with cooling or Overload
protection with heating in
Indoor Unit
X
○
○
Indoor unit coil temperature sensor is loose
Indoor unit coil temperature sensor failure
Indoor unit control board failure
Refrigerant system is running abnormally
Compressor drive issue
○
X
○
Outdoor drive board failure
Compressor failure
Outdoor control board failure
Locked rotor outdoor fan
motor protection
○
○
★
Outdoor fan motor connection is loose
Outdoor fan has blockage
Fan motor failure
Outdoor control board failure
Outdoor coil anti-overload
protection with cooling
X
★
X
System has too much refrigerant
Outdoor fan motor failure
Dirty condenser
Air inlet and/or air outlet of the indoor unit or outdoor unit is
blocked or abnormal
IPM module protection
X
○
X
IPM board failure
Outdoor unit fan is broken
Outdoor unit motor failure
Outdoor unit fan is blocked
Condenser requires cleaning
Outdoor unit installed improperly
PFC protection
○
X
X
PFC failure
Outdoor Unit drive board failure
Compressor preheating
process
○
★
○
Unit in normal mode during cold weather
Outdoor board chip issue
★
X
○
Wrong drive board
Wrong compressor
AC voltage too high or
too low protection
★
★
○
Supply voltage is higher or lower than normal
Internal voltage supply of the unit is higher or lower than normal
DC compressor
○
○
X
Outdoor drive board failure
Compressor failure
Outdoor ambient
temperature too low
protection
★
○
○
Outdoor ambient temperature is too low
Light flash every 2 seconds for the following faults
Outdoor radiator
overheated protection
○
X
X
Radiator sensor failure
Detection circuit of the sensor on control panel failure
System high pressure
failure protection
○
○
X
Pressure switch failure
Pressure detection switch on the control panel failure
System pressure measurement exceeds system limit