MrCool DIY E Star Series Installation & Owner's Manual page 57

10.12 Error Code: 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:
Check the wiring between the
Check the outdoor fan and
the outdoor unit ventilation.
Replace the outdoor PCB.
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.
The error codes and descriptions are for reference only. If your system displays any of
these codes contact a qualified technician to investigate the matter further.
PCB and compressor
Is it improperly wired?
NO
Check the IPM.
Is it functioning
properly?
YES
Is it functioning
properly?
YES
Check the compressor
resistance values.
Are they within
acceptable parameters?
YES
****Disclaimer****
Ensure proper connections or
YES
replace 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.
mrcool.com Page 56