Carrier 40MAHB Series Service Manual page 28

40MAHB: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
IPM Malfunction or IGBT over-strong current protection (PC00)
Description: If the IPM sends an abnormal voltage signal to the compressor drive chip, the LED displays the failure code and the unit turns off.
Recommended parts to repair:
• Communication 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 if the IPM
is installed correctly.
IPM continuity check
terminal resistance
Check the outdoor fan and the
outdoor unit's ventilation.
Is it in working order?
Check the compressor
resistance values.
Are they the same?
Replace the outdoor PCB.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
YES
NO
YES
Is the IPM
uniform?
YES
YES
YES
Ensure proper connections or
replace the wires and connectors.
Correct the installation, tighten the
NO
screws and apply silicon grease.
Replace the IPM board or
NO
replace the outoor PCB.
Please refer to the "Fan Speed is
NO operating outside of normal range"
malfunction.
Replace the compressor.
NO
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