Inverter Compressor Drive Error Diagnosis And Solution (P4) - COMFORT-AIRE A-DVC24SF-1 Service Manual

8.2.11 Inverter compressor drive error diagnosis and solution (P4)

Error Code
Malfunction conditions
Possible causes
Troubleshooting:
Check if the wiring between main
PCB and compressor connected
well?
Yes
Check the reactor or
Inductance .Is it normal?
Yes
Is the IPM installed correctly?
Yes
IPM continuity check. Are the IPM
terminal resistance values uniform?
Yes
Check if the outdoor fan runs
properly or the outdoor unit
ventilation is good.
Yes
Are the compressor resistance
values uniform?
Yes
Replace the outdoor main PCB.
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
●
No
No
No
No
the main PCB if the IPM board and
Please refer to the solution of 【Fan
No
Speed Has Been Out Of Control】
No
52
Service Manual - DVC 09/12/18/24 SF Series
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
main PCB are integrated together.
malfunction
Replace the compressor.
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