Carrier 40MBFAQ Service Manual page 24

40MBFAQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
PC 00(IPM malfunction or IGBT over-strong current protection Diagnosis and Solution)
Description: When the voltage signal that the IPM sends to the compressor drive chip is abnormal, the display LED
displays "PC 00" and the air conditioner turns off.
Recommended parts to prepare:
• Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
• Outdoor PCB
Troubleshooting
Check the wiring between
the PCB and the 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, the outdoor PCB cannot be removed separately. In this case, the outdoor electric control box should be
replaced as a whole.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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.
Refer to the "Fan Speed is Out of Control"
malfunction.
Replace the compressor .
NO
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