Inverter Compressor Drive Error Diagnosis And Solution - Century B-VMH36SD-1 Service Manual

9.3.11 Inverter compressor drive error diagnosis and solution (P4)
Error Code
Malfunction conditions
Possible causes
Troubleshooting:
For 9K~18K:
Check that the wiring between
main PCB and compressor
are connected well.
Check the reactor or
inductor. Is it normal?
Check the IPM.
Is it installed correctly?
IPM continuity check.
Make sure the IPM terminal
resistance values are uniform.
Check the outdoor fan to make
sure it runs properly and the
outdoor unit ventilation is good.
Check that the compressor
resistance values are uniform.
Replace the outdoor main PCB if the
main PCB and IPM are separate.
Service Manual - VMH 9/12/18/24 SU & VMH30/36S D Series
P4
An abnormal inverter compressor drive is detected by a special
detection circuit, including communication signal detection,
voltage detection, compressor rotation speed signal detection
and so on.
Wiring error
●
IPM malfunction
●
Outdoor fan assembly faulty
●
Compressor malfunction
●
Outdoor PCB faulty
●
42
Correct the connection
or replace the wires
and connectors.
Replace the reactor
or inductor.
Correct the installation,
tighten the screws and
apply silicon grease.
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.