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DIAGNOSIS AND SOLUTION (CONT)
Table 26—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
Troubleshooting
Check the wiring between the main
PCB and compressor. Is it improperly
wired?
Ensure proper connection or
replace the wires and connectors
Yes
No
Check the IPM. Is it functioning
properly?
No
Yes
Replace the IPM board or replace
the main PCB
Check the outdoor fan and the
outdoor unit ventilation. Is it
functioning properly?
No
Please refer to “Fan Speed
Malfunction”
Yes
Check the compressor resistance
values. Are they within acceptable
parameters?
No Replace the compressor
Yes
Replace the outdoor main PCB
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