Samsung AC052MN4DKH Service Manual page 77

Troubleshooting
1. Test items
1) Check the power connection. / Check the restart after power reset.
Is there a fault in input power? (Single-phase : 220Vac, 3-phase : 380Vac)
Does error occur again at operation after power is reset?
2) Check the compressor and the state of compressor wire assembling.
3) Check the outdoor unit installation environment.
Check for disconnection of the wires regarding the Inverter PCB of the outdoor unit and check the installation environment.
At the site where several units were installed at the same time, check whether communication wire and pipes have been wrongly connected!
2. Check procedure
Power on 30 seconds after power off.
Power on 30 seconds after power off.
Check the compressor
and its connecting wires.
1. Are all the resistance values between phases
matched? (U
2. Is compressor wiring normal?
(disconnection, wrong connection)
3. Is there any abnormal
noise from compressor
Is indoor and outdoor unit wiring/piping
installed properly?
4-42
Yes
V, U W, V W)
rotation?
Yes
Yes
Continue
No
1. Replace the compressor : If the resistance
value between phases of the compressor is
different.
No
Power on.
End the service.
2. Reassemble wire : If the wire connection of
the compressor is wrong.
Power on.
End the service.
3. Replace the compressor : When loud
abnormal noise generates (metal cutting or
grinding noise), or severe vibration.
No
Install again by following the standard
Piping
Wiring
End the service.
Check the normal operation.
Check the normal operation.
specifications.
Bad installation
Samsung Electronics