Service Manual
2. IPM protection(H 5), de sy nc hro n iz in g m alfu n ction (H 7), ove rc urre nt o f co m pres so r phase cu rre n t (P5) (AP1 belo w m eans
co n tro l board o f ou td o o r unit)
Main detection points:
• Is voltage input within the normal range
• If the control board AP1 is well connected with compressor COMP? If they are loosened? If the connection sequence is correct?
• Heat exchange of unit is not good (heat exchanger is dirty and unit radiating environment is bad);
• If the system pressure is too high?
• If the refrigerant charging amount is appropriate?
• 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 good?
Malfunction diagnosis process:
76
£ Installation and Maintenance
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