68
Troubleshooting
(3) IPM protection, desynchronizing malfunction, phase current of compressor is overcurrent (AP1 below is control board
of outdoor unit)
Main detection point:
z
If control board AP1 and compressor COMP is well connected? If they are loosened? If the connection sequence is
correct?
z
Is voltage input in the normal range (Test the voltage between L
ǃ
N of wiring board XT by DC voltage meter)?
z
If coil resistance of compressor is normal? Is compressor coil insulating to copper pipe well?
z
If the work load of unit is heavy? If radiating of unit is well?
z
If the refrigerant charging is appropriate?
Malfunction diagnosis process:
