P0(Ipm Malfunction Or Igbt Over-Strong Current Protection Diagnosis And Solution) - Carrier 42QHP09E8S Service Manual

5.9

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:
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.
 Page 70 
YES
NO
NO
YES
NO
YES
YES
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 "Fan
Speed is Out of Control"malfunction.
NO Replace the compressor.