Communication Error Between Outdoor Unit Inv ↔ Main Micom (1 Min.)(Error Code: E203) - Samsung AC026RN1DKG Service Manual

Troubleshooting
4-3-10 Communication error between outdoor unit INV ↔ MAIN MICOM (1 min.)(Error Code: E203)
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) ↔ Main PCB (CN39)?
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) ↔ Main PCB (CN39)?
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 → The outdoor
unit Inverter PCB is normal.
4-34
Yes
Yes
Yes
No
Check the power connection and fuse.
1. Is there a problem in the power wire connection
between Main ↔ EMI PCB of the outdoor unit?
No
2. Is there a problem in power wire connection
between the Inverter ↔ EMI PCB of the outdoor
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.
Samsung Electronics