Samsung AC071MN4PKH - MAIN MICOM (1 Min.)(Error Code: E203)

Troubleshooting
4-39
4-4-11. Communication error between outdoor unit INV ļ 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) ļ Main PCB (CN39)?
4) Check the communication wire connections.
2. Check procedure
Yes (In case of AC023/030/040/052/060/072JX*PBH1
series, replace the PCB, After resetting the power,
reconfirm and then close.)
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 ļ EMI PCB of the outdoor unit?
2. Is there a problem in power wire connection
between the Inverter ļ 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 Main PCB, replace the Main PCB
ĺ The 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) ļ Main
PCB (CN39)?