Heat Controller B-DVH09SD-0 Service Manual page 42

DVC/DVH Inverter Mini-Split
10.3.7 IPM Malfunction or IGBT Over Current Protection Diagnosis and Solution (P0)
Error Code
Malfunction decision
conditions
Possible Causes
Trouble shooting:
Check if the wiring between main
PCB and compressor connected by
error and if the wires and connectors
are broken?
IPM continuity check. Check if the
IPM terminal resistance values are
uniform. Refer to page 64.
Check if the outdoor fan runs
properly or the outdoor unit
ventilation is good.
Check if the compressor resistance
values are uniform .Refer to page 63.
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 unit will
turn off.
Wiring error
●
IPM malfunction
●
Outdoor Fan Assembly faulty
●
Compressor Malfunction
●
Outdoor PCB Faulty
●
No
Yes
Yes
Yes
Yes
Replace the IPM board or replace the
No main PCB if the IPM board and main
please refer to the below remark, check whether the
No resistance of the fan motor is normal. If not, replace
No Replace the compressor.
42
Correct the connection or replace
the wires and connectors.
PCB are integrated together.
the fan motor.
Heat Controller