Samsung AM022FN1DEH/TK Service Manual page 225

Troubleshooting
4-4-36 MCU branch part setup error – Connect more Indoor units than what is actually set up in MCU
Outdoor unit display
Indoor unit display
Criteria
Cause of problem
1. How to check
Check the number of indoor units connected to MCU then readjust the switch for the number of units
After completing resetting, press the outdoor unit's K3 button to reset or turn off to restart.
MCU BOX #0
1
Branch A B
1 2
4-80
×(Operation) ◑(Timer)
Outdoor unit
PCB
Indoor number setup MCU number setup
MCU address setup
MCU PCB
0
ON
Branch part use setup
OFF
2 2 1 8 6
Indoor unit address
C D E
8
◑(Fan) ◑(Filter) ×(Defrost)
6 2 1
MCU BOX #1
1
F Branch A
6
MCU PCB
1
ON
OFF
3 7 9 0 0
B C D E
7 0
Samsung Electronics
F