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Inverter compressor drive error diagnosis and
solution(P4)
Error Code P4
Malfunction decision conditions An abnormal inverter compressor drive is detected by a special detection circuit, including communication
signal detection, voltage detection, compressor rotation speed signal detection and so on.
Supposed causes
S Wiring mistake
S IPM malfunction
S Outdoor fan assembly fault
S Compressor malfunction
S Outdoor PCB faulty
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