Ipm Malfunction/Igbt Over-Strong Current Protection Diagnosis/Solution - Century B-VMH36SD-1 Service Manual

Service Manual - VMH 9/12/18/24 SU & VMH30/36S D Series
9.3.8 IPM malfunction or IGBT over-strong current protection diagnosis and solution (P0)
Error Code
Malfunction conditions
Possible causes
Troubleshooting:
For 9K~18K:
Check the wiring between main
PCB and compressor. Are the wires
and connectors broken?
IPM continuity check. Check to
make sure the IPM terminal
resistance values are uniform.
Check whether the outdoor fan
runs properly or the outdoor
unit ventilation is good.
Check whether the compressor
resistance values are uniform.
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 error
●
IPM malfunction
●
Outdoor fan assembly faulty
●
Compressor malfunction
●
Outdoor PCB faulty
●
38
35
Correct the connection or replace
the wires and connectors.
Replace the IPM board or replace the
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.