Compressor X; Ipm Module Board; Electric Control Box - Carrier 40MBAB Series Service Manual

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
PC 04 - Inverter compressor drive error Diagnosis and Solution
Description: An abnormal inverter compressor drive is detected by a special detection circuit, including the communication
signal detection, voltage detection, compressor rotation speed signal detection.
Recommended parts to prepare:
• Connection wires

• IPM module board

• Outdoor fan assembly
• Compressor
• Outdoor PCB
Troubleshooting and Repair:
NOTE: For certain models, the outdoor PCB could not 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.
Check the wiring between the
PCB and compressor.
Is it improperly wired?
NO
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 "Fan
NO
Speed Malfunction"
NO Replace the compressor.
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