Carrier 40MAHB Series Service Manual page 35

40MAHB: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Inverter compressor Drive Error (PC04)
Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage
detection, compressor rotation and speed signal detection.
Recommended parts to repair:
• Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
• Outdoor PCB
Troubleshooting
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Check the wiring between the
PCB and the compressor
Is it improperly wired?
Check the IPM.
Is it functioning
properly?
YES
Check the outdoor fan and
the outdoor unit ventilation.
Is it functioning
properly?
YES
Check the compressor
resistance values.
Are they within
acceptable parameters?
YES
Replace the outdoor PCB.
Ensure proper connections or replace
YES
the wires and connectors.
Replace the IPM board or
NO
replace the outdoor PCB.
Please refer to
NO
"Fan Speed Malfunction"
NO Replace the compressor.
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