5.13
P4(Inverter compressor drive error diagnosis and solution)
Description:
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.
Recommended parts to prepare:
• Wiring mistake
• IPM malfunction
• Faulty outdoor fan assembly
• Compressor malfunction
• Faulty outdoor PCB
Troubleshooting and repair:
YES
NO
NO
YES
NO
YES
NO
YES
Page 85
Replace the outdoor PCB.
Check the wiring between the
PCB and compressor.
Is it improperly wired?
Ensure proper connections or replace
the wires and connectors.
Is it functioning
properly?
Check the IPM.
Replace the IPM board or
replace the outdoor PCB.
Is it functioning
properly?
Please refer to “Fan
Speed Malfunction”
Are they within
Check the compressor
resistance values.
Replace the compressor.
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