Troubleshooting
Samsung Electronics 4-9
4-2-2. Communication error between outdoor unit INV ↔ MAIN MICOM (1 min.) - (E203)
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)
4. Check Fan Motor
- Fan Motor problem can occur PBA power defect.
· Check PBA power supply after remove connector of Fan Motor.
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 → 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 communication between
the outdoor unit Inverter PCB (CN351)
↔ Main PCB (CN302)?
Outdoor unit display
Judgment Method • Refer to checking method, as shown below
Cause of problem • Communication error between the outdoor unit INV and Main Micom for one minutes
1.
Cause of problem
To Next Page
Loading...
