Troubleshooting
Samsung Electronics 23
3-3 Communication error (1 minute) between Main and Sub Micoms of an Outdoor unit or
among Outdoor Units (Error Code : E203)
1. Check items
1) Is there power on outdoor unit inverter PBA?
2) Connect the power cable/check the fuse
3) Is there any problem on communication cable between outdoor unit inverter (CN31) <-> Main PBA (CN39)?
4) Check the communication cable connection
2. Check procedure
Yes
End service
No
Is there any communication error?
Connect the power cable/check the fuse
1. Is there any problem on the power cable between
outdoor unit main l EMI PBA?
2. Is there any problem on the power cable between
outdoor unit inverter l EMI PBA?
No
Yes
Turn off the power and turn it on again after 30 seconds.
Change the outdoor unit inverter or main PBA
1. If the 7-segment on the outdoor unit main PBA shows E203
error, change the PBA o outdoor unit main PBA is normal
2. When the LED on the outdoor unit inverter is shown as
following; Red-On, Green-On, Orange-Blinking and if the
7-segment on the outdoor unit main PBA does not display
anything, change the main PBA o Outdoor unit inverter
PBA is normal
[Check list for AM666FXMDCH series]
[Check the LED on inverter PBA]
Check the communication cable connection
No
Yes
[Check list for AM666FXMDCH series]
Is there power on Inverter PBA?
Inverter PBA connector (CN31)
MAIN PBA connector (CN39)
Is there any problem on
communication cable between outdoor unit inverter
(CN31) l Main PBA (CN39)?
[AM666FXMDCH series
inverter PBA LED]
[7-segment on
Main PBA (Common)]
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