Midea MS11M-09HRFN1-BW0W Service Manual page 40

9.3.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
For 9K~18K:
Check if the wiring between main
PCB and compressor . If the wires
and connectors are broken?
No
IPM continuity check. Check if the
IPM terminal resistance values are
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 send to compressor drive chip
is abnormal, the display LED will show "P0" and AC will turn off.
Wiring mistake
●
IPM malfunction
●
Outdoor fan ass'y faulty
●
Compressor malfunction
●
Outdoor PCB faulty
●
No
Correct the connection or replace
Yes
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
No Replace the compressor.
38
the wires and connectors.