Pc 00(Ipm Malfunction Or Igbt Over-Strong Current Protection Diagnosis And Solution) - Mars Comfort-Aire Century VCD-SA Series Service Manual

Service Manual - VCDxxSA
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?
Is it in working order?
Check the outdoor fan and the
outdoor unit ventilation.
Is it in working order?
Check the compressor
resistance values.
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.
NO
Check the IPM.
YES
YES
Are they within
YES
 Troubleshooting 30
Ensure proper connections or
YES
replace the wires and connectors.
Replace the IPM board or
NO
replace the outdoor PCB.
Please refer to the solution of the "Fan
NO
Speed is Out of Control"malfunction.
NO
Replace the compressor.
