CH 01
Indoor unit communication error
CH 02
Sensor error (indoor coil)
CH 05
Outdoor communication failure
CH 06
DC link voltage error
CH 21
DC compressor overload
CH 22
DC compressor problem
CH 29
Compressor phase error
CH 32
High pressure switch error
CH 33
Low pressure switch error
CH 38
Refrigerant leak detected
CH 44
Outdoor temperature sensor error
CH 54
Phase reversal error
CH 67
PCB communication error