Service Manual
54
Installation and Maintenance
2. 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
□ ☆ □ □
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