Communication Error (1 Minute) Between Main And Sub Micoms Of An Outdoor Unit Or Among Outdoor Units (Error Code : E203) - Samsung AM036NXMDCR Service Manual

Troubleshooting
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
Turn off the power and turn it
on again after 30 seconds.
Is there any communication error?
Yes
Is there power on Inverter PBA?
Is there any problem on
communication cable between outdoor unit inverter
(CN31) ↔ Main PBA (CN39)?
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 → 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 →
Outdoor unit inverter PBA is normal.
[7-segment on [AMSSSSXMDCS series
Main PBA (Common)]
40
[Check the LED on inverter PBA]
Yes
Yes
inverter PBA LED]
No
Connect the power cable/check the fuse.
1. Is there any problem on the power cable between
outdoor unit main ↔ EMI PBA?
2. Is there any problem on the power cable between
No
outdoor unit inverter ↔ EMI PBA?
3. Is the fuse (FUSE100) on outdoor unit inverter PBA
normal? (Short-Normal, Open-Abnormal.
Only applies to RDSSSHXHS series)
[Check list for AMSSSSXMDCS series]
No
Check the communication cable connection.
[Check list for AMSSSSXMDCS series]
Inverter PBA connector (CN31)
End service.
MAIN PBA connector (CN39)
Samsung Electronics