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Troubleshooting
4-5-34 MCU branch part setup error – Connect more Indoor units than what is actually set up in MCU
Outdoor unit display
(Operation)
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.
Outdoor unit
MCU BOX #0
MCU PCB
OFF
1
2
2
Branch A
B
C
1
2
4-93
◑(Timer)
◑(Fan)
◑(Filter)
6
1
2
PCB
Indoor number setup MCU number setup
MCU address setup
0
ON
Branch part use setup
1
8
6
Indoor unit address
D
E
F
8
6
(Defrost)
MCU BOX #1
MCU PCB
ON
OFF
1
3
7
9
0
Branch A
B
C
D
7
1
0
E
F
0
Samsung Electronics
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