Ipm Malfunction Or Igbt Over-Strong Current Protection Diagnosis And Solution (P0) - COMFORT-AIRE A-DVC24SF-1 Service Manual

8.2.8 IPM malfunction or IGBT over-strong current protection diagnosis and solution (P0)

Error Code
Malfunction conditions
Possible causes
Troubleshooting:
For 9K~24K:
Check the wiring between main PCB
and compressor. Are the wires or
connectors broken?
No
IPM continuity check. Are the IPM
terminal resistance values uniform?
Yes
Check if the outdoor fan runs
properly or the outdoor unit
ventilation is good.
Yes
Check if the compressor resistance
values are uniform .
Yes
Replace the outdoor main PCB if the
main PCB and IPM are separate.
P0
When the voltage signal that IPM sends to compressor drive chip
is abnormal, the display LED will show "P0" and AC will turn off.
Wiring error
●
IPM malfunction
●
Outdoor fan assembly faulty
●
Compressor malfunction
●
Outdoor PCB faulty
●
No
No
Service Manual - DVC 09/12/18/24 SF Series
Correct the connection or replace
Yes
the wires and connectors.
Replace the IPM board or replace the
No main PCB if the IPM board and main
PCB are integrated together.
Please refer to the solution of 【Fan Speed Has Been
Out Of Control】malfunction
Replace the compressor.
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