5.10
P0(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
“P0” and the AC turn off.
Recommended parts to prepare:
• Wiring mistake
• IPM malfunction
• Faulty outdoor fan assembly
• Compressor malfunction
• Faulty outdoor PCB
Troubleshooting and repair:
NO
YES
NO
YES
NO
YES
Page 82
Replace the outdoor PCB.
Check the wiring between
PCB and compressor.
Does an error exist?
Ensure proper connections or
replace the wires and connectors.
Is it in working order?
NO
Replace the IPM board or
replace the outdoor PCB.
Check the IPM.
Is it in working order?
Are they within
acceptable parameters?
Check the compressor
resistance values.
Replace the compressor.
Trou
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