Samsung AC052MN4DKH Service Manual page 65

Troubleshooting
1. Test items
1) Is power supplied to outdoor unit Inverter PCB?
2) Check the power wire connection and fuse.
3) Is there a problem in the communication wire connections between the outdoor unit Inverter (CN31)
4) Check the communication wire connections.
2. Check procedure
Power on 30 seconds after power off.
Does communication error occurs?
Is power supplied to Inverter PCB?
Is there a problem in the connections of
communications between the outdoor unit
Inverter (CN31)
Replace the outdoor unit inverter or Main PCB.
1. If E203 Error to 7-segment of outdoor unit Main PCB is
displayed, replace the Inverter PCB and then outdoor
unit Main PCB is normal.
2. If Red - ON, Green - OFF, and Yellow - Blink are
displayed in the LED display of outdoor unit Inverter,
and there is no indication in 7-segment of outdoor
unit Main PCB, replace the Main PCB
unit Inverter PCB is normal.
4-30
Yes (In case of AC023/030/040/052/060/072JX*PBH1
series, replace the PCB, After resetting the power,
reconfirm and then close.)
Yes
Main PCB (CN39)?
Yes
The outdoor
Main PCB (CN39)?
No
Check the power connection and fuse.
1. Is there a problem in the power wire connection
between Main
No
2. Is there a problem in power wire connection
between the Inverter
unit?
3. Is the fuse (Fuse100) of outdoor unit Inverter PCB
normal? (Short-Normal, Open-Fault)
No
Check the communication wire connections.
End the service.
EMI PCB of the outdoor unit?
EMI PCB of the outdoor
Samsung Electronics