Carrier 40MAHBQ06XA Service Manual page 32

SG-40MAHB-01: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Inverter compressor drive error diagnosis and solution (P4)
Malfunction Decision Conditions
An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection
and compressor rotation speed signal detection.
Possible Causes:
• Wiring mistake
• IPM malfunction
• Outdoor fan assembly faulty
• Compressor malfunction
• Outdoor PCB faulty
Troubleshooting
Check the wiring between the main PCB
and the compressor.
Check the outdoor fan and the
outdoor unit ventilation.
Check the compressor resistance values.
Replace the outdoor main PCB.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
No
Check the IPM.
Yes
Yes
Yes
Correct the connection or replace
Yes
the wires and connectors.
Replace the IPM board or replace
No
the main PCB.
Refer to the
No
Fan Speed Out of Control
Malfunction solution.
No Replace the compressor.
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