Pc 04(Inverter Compressor Drive Error Diagnosis And Solution) - MrCool DIY E Star Series Troubleshooting Manual

7.12 PC 04(Inverter compressor drive error diagnosis and solution)

Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication
signal detection, voltage detection, compressor rotation speed signal detection and so on.
Recommended parts to prepare:
• Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
• Outdoor PCB
Troubleshooting and repair:
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
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 .
Troubleshooting 33
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 .