Troubleshooting
4-34 Samsung Electronics
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
Yes
End the service.
No
Does communication error occurs?
Check the power connection and fuse.
1. Is there a problem in the power wire connection
between Main ↔ EMI PCB of the outdoor unit?
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
Yes
Power on 30 seconds after power off.
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 Inverter PCB is normal.
Check the communication wire connections.
No
Yes
Is power supplied to Inverter PCB?
Is there a problem in the connections of
communications between the outdoor unit
Inverter (CN31) ↔ Main PCB (CN39)?
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