53
Installation and Maintenance
Service Manual
7. IPM protection, desynchronizing malfunction, phase current of compressor is overcurrent (outdoor unit
malfunction)
Outdoor unit malfunction indicator status
Main detection point:
●If control board AP1 and compressor COMP is well connected? If they are loosened? If the connection sequence is correct?
●Is voltage input in the normal range (Test the voltage between L, N of wiring board XT by DC voltage meter)?
●If coil resistance of compressor is normal? Is compressor coil insulating to copper pipe well?
●If the work load of unit is heavy? If radiating of unit is well? If the refrigerant charging is appropriate?
Malfunction diagnosis process:
Malfunction
D5
D6
D16
D30
IPM protection
□
☆
□
■
Desynchronizing malfunction
□
☆
■
☆
Compressor overcurrent
□
☆
□
□
