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42
DIAGNOSIS AND SOLUTION (CONT)
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, etc.
Supposed causes
S Wiring mistake
S IPM malfunction
S Outdoor fan assembly faulty
S Compressor malfunction
S Outdoor PCB faulty
Troubleshooting
Check the wiring between main PCB
and 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
Please refer to the solution of ǏFan
Speed Has Been Out Of Controlǐ
malfunction
Yes
Check the compressor resistance
values
No Replace the compressor.
Yes
Replace the outdoor main PCB
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