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34
DIAGNOSIS AND SOLUTION (CONT.)
Inverter Compressor Drive Error (PC04)
Troubleshooting
Error Code PC04
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, etc.
Supposed causes
Wiring mistake
IPM malfunction
Outdoor fan assembly faulty
Compressor malfunction
Outdoor PCB faulty
Check the wiring between
the main PCB and the compressor.
Correct the connection or replace
the wires and connectors.
Yes
No
Check the IPM.
No
Yes
Replace the IPM board or replace
the main PCB.
Check the outdoor fan and the
outdoor unit ventilation.
No
Refer to the
Fan Speed Has Been Out of Control
malfunction solution.
Yes
Check the compressor
resistance values.
No Replace the compressor.
Yes
Replace the outdoor main PCB.
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