Owner's Manual

mrcool.com Page 51
10.8 Error Code: PC 00 (IPM malfunction or IGBT over-strong current protection diagnosis and solution)
Description: When the voltage signal that the IPM sends to the compressor drive chip is abnormal, the LED
will display the failure code and the A/C will turn off.
Recommended parts to prepare:
•
Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
•
Outdoor PCB
Troubleshooting and repair:
Check the wiring between
the PCB and compressor.
Does an error exist?
Ensure proper connections or
replace the wires and connectors.
Check the IPM.
NO
Is it in working order?
Replace the IPM board or
replace the outdoor PCB.
Check the outdoor fan and the
outdoor unit ventilation.
YES
Is it in working order?
Please refer to the solution for the “Fan
Speed is Outside of Normal Range”
solution.
NO
Check the compressor
resistance values.
YES
Are they within
acceptable parameters?
Replace the compressor.
Replace the outdoor PCB..
YES
NO
NO
YES
Note: For certain models, the outdoor PCB cannot be removed separately. In this case, the outdoor
electric control box should be replaced as a whole.
****Disclaimer****
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.