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7.12 P4/PC 04(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:
• Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
• Outdoor PCB
Troubleshooting and repair:
Check the outdoor fan and the
Note: For certain models, outdoor PCB cannot be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
Check the wiring between
PCB and compressor.
Does an error exist ?
NO
Check if the IPM
installed correctly.
YES
IPM continuity check
Are the IPM terminal
resistances uniform?
YES
outdoor unit ventilation.
Is it in working order?
YES
Check the compressor
resistance values.
Are they uniform?
YES
Replace the outdoor PCB.
Troubleshooting
Ensure proper connections or
YES
replace the wires and connectors.
Correct the installation , tighten the
NO
screws and apply silicon grease
Replace the IPM board or
NO
replace the outdoor PCB.
Please refer to the solution of the
"Fan Speed is operating outside of
NO
normal range" malfunction.
Replace the compressor.
NO
34
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