ACPro Y Series Troubleshooting Manual page 30

7.7 PC 00(IPM malfunction or IGBT over-strong current protection Diagnosis and Solution)
Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows
"PC 00" and the AC turn off.
Recommended parts to prepare:
• Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
• Outdoor PCB
Troubleshooting and repair:
Check the wiring between
PCB and compressor.
Does an error exist?
Check the IPM.
Is it in working order?
Check the outdoor fan and the
outdoor unit ventilation.
Is it in working order?
Check the compressor
resistance values.
Are they within
acceptable parameters?
Replace the outdoor PCB.
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
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Troubleshooting 30
Ensure proper connections or
replace the wires and connectors.
Replace the IPM board or
replace the outdoor PCB.
Please refer to the solution of the
Speed is Out of Control malfunction.
Replace the compressor.
Fan