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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
×(Operation)
Criteria
• Occurs when the number of indoor units installed exceeds that registered in MCU.
Cause of problem
• Number of indoor units exceeds number of indoor units entered on MCU setting.
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
OFF
1
2
Branch A
B
1
2
Samsung Electronics
◑(Timer)
◑(Fan)
Outdoor unit
6
PCB
Indoor number setup MCU number setup
MCU address setup
MCU PCB
0
ON
Branch part use setup
2
1
8
6
Indoor unit address
C
D
E
F
8
6
◑(Filter)
×(Defrost)
2
1
MCU BOX #1
MCU PCB
OFF
1
3
7
9
Branch A
B
C
7
Troubleshooting
1
ON
0
0
D
E
F
0
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Troubleshooting
