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Service Manual -
VMH 9/12/18/24 SU & VMH30/36S D Series
35
38
9.3.
8
IPM malfunction or IGBT over-strong current protection diagnosis and solution
(P0)
Error Code
P0
Malfunction conditions
When the voltage signal that IPM send to compressor drive chip
is abnormal, the display LED will show “P0” and AC will turn off.
Possible
causes
●
Wiring
error
●
IPM malfunction
●
Outdoor fan ass
embly
faulty
●
Compressor malfunction
●
Outdoor PCB faulty
Troubleshooting:
For 9K~18K:
Check the wiring between main
PCB and compressor. Are the wires
and connectors broken?
Check whether the outdoor fan
runs properly or the outdoor
unit ventilation is good.
Check whether the compressor
resistance values are uniform.
Please refer to the solution of [Fan Speed Has
Been Out Of Control] malfunction.
Replace the outdoor main PCB if the
main PCB and IPM are separate.
IPM continuity check. Check to
make sure the IPM terminal
resistance values are uniform.
Replace the compressor.
Replace the IPM board or replace the
main PCB if the IPM board and main
PCB are integrated together.
Correct the connection or replace
the wires and connectors.