Heat Controller B-DVH09SD-0 Service Manual page 47

Heat Controller
10.3.9 Inverter Compressor Drive Error Diagnosis and Solution (P4)
Error Code
Malfunction decision
conditions
Possible Causes
Trouble shooting:
Check if the wiring between main
Check if the wiring between main
PCB and compressor connected by
PCB and compressor are properly
error and if the wires and connectors connected and if any wires or
connectors are broken?
are broken?
IPM continuity check. Check if the
IPM continuity check. Check if the IPM
IPM terminal resistance values are
terminal resistance values are uniform.
uniform. Refer to page 64. Refer to pages 40-41.
Check if the outdoor fan runs
Check if the outdoor fan runs
properly or the outdoor unit
properly and if the outdoor
unit's ventilation is good. ventilation is good.
Check if the compressor resistance
Check if the compressor resistance
values are uniform.
values are uniform .Refer to page 63.
Refer to the following page.
Replace the outdoor main PCB if the
main PCB and IPM are separate.
P4
An abnormal inverter compressor drive is detected by a special
detection circuit, including communication signal detection,
voltage detection, and compressor rotation speed signal
detection, etc.
Wiring mistake
●
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
For MSV1-09HRFN1-MT0W and MSV1-12HRFN1- MT0W
efer to the solution of fan speed has been out
models, r
Check whether the resistance
of control malfunction . Find out the cause and have it
of the fan motor is normal.
No
solved. For other models, please refer to the below
If not, replace the fan motor.
remark, check whether the resistance of the fan motor
is normal. If not, replace the fan motor.
No Replace the compressor.
47
DVC/DVH Inverter Mini-Split
Correct the connection or replace
the wires and connectors.
PCB are integrated together.
Refer to pages 34-35.