Technical Information
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2. IPM protection, desynchronizing malfunction, phase current of compressor is overcurrent (AP1 below
control board of outdoor unit)
Main detection points:
• Is control board AP1 and compressor COMP well connected? Are tehy loose? Is connection sequence
correct?
• Is voltage input in the normal range (Test the voltage between L, N of wiring board XT by DC voltage
meter)?
• Is coil resistance of compressor is normal? Is compressor coil insulating to copper pipe well?
• Is the work load of unit heavy? Is radiating unit is correct?
• Is the refrigerant charging appropriately?
Malfunction diagnosis process: