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Troubleshooting
(3) IPM protection, desynchronizing malfunction, phase curr
ent 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 LǃN 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:
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