Troubleshooting
Samsung Electronics
4-67
4-4-10. Communication error between outdoor unit INV
↔
MAIN MICOM (1 min.)
(Error Code: 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)
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 communications between
the outdoor unit Inverter (CN31)
↔
Main
PCB (CN39)?
Display
Outdoor Unit display
E203
Wired remote Control, Wind Free RAC
E203
Duct, 1way Cassette
4way Cassette,
4way Cassette(600x600)
MAX4
Console
360 Cassette
or
or
or
GRN
◑
Duct
Blue
Red
1way
Blue Yellow
X
X
◑
◑
X
X
◑
◑
X
X
◑
◑
X
◑
◑
X
X
Judgment
method
Refer to checking method, as shown below
Symtom
Communication error between the outdoor unit INV and Main Micom for one minutes