Mark HCNI 533, Technical Manual

Page: 66 / 84

66
8.5.9 P0 / PC 00 (IPM malfunction or IGBT over-strong current protection diagnosis and
solution)
Description:
When the voltage signal which the IPM sends to the compressor drive chip is abnormal,
the LED displays the failure code and the AC turns off.
Recommended parts to check or 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.
“Wall” Type Active Line R32 Refrigerant AC: 6. Troubleshooting
[6]-28
Troubleshooting and repair:
YES
NO
Is it in working order?
NO
YES
NO
YES
Replace the compressor.
YES
NO
6.7.9 P0 / PC 00 (IPM malfunction or IGBT over-strong current protection diagnosis and solution)
Description:
When the voltage signal which the IPM sends to the compressor drive chip is abnormal, the LED
displays the failure code and the AC turns off.
Recommended parts to check or to prepare:
• Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
• Outdoor PCB
Check the wiring between
PCB and compressor.
Does an error exist?
Ensure proper connections or replace
the wires and connectors.
Check the IPM.
Replace the IPM board or
replace the outdoor PCB .
Check the outdoor fan and
the outdoor unit ventilation.
Is it in working order?
Please refer to the solution of the “Fan
Speed is Out of Control” malfunction.
Check the compressor
resistance values.
Replace the outdoor PCB.
Are they
within acceptable
parameters?
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.