Samsung AVMKH020EA0 Service Manual page 240

8-2-57. Indoor unit address setup error of MCU
Outdoor unit display
MCU display
Judgment method
Causes
Check the error of outdoor unit
display part and find the address of MCU and
rotary switch for indoor unit address.
Check the address of indoor unit connected
with each above MCU rotary switch for
indoor unit address.
Are not 2 address values the same?
Restart after setting 2 indoor unit addresses and
MCU address setup value differently.
, , and
Only is flickering.
- W
- Rotary switch for indoor unit address in MCU was overlapped among MCU.
Yes
- 239 -
are flickering in sequence.
No
If the error is occurred again after
restarting with a change DIP switch of
MCU and indoor unit address setup,
replace MCU PCB.
Troubleshooting