Troubleshooting
Samsung Electronics 4-77
4-4-34 MCU branch part setup error – Set as being used without connection to an Indoor unit
1. How to check
Adjust the Dip switch that sets up the use of MCU branch part to ‘Not-Used'. After completing resetting, press the outdoor unit's
K3 button to reset or turn off to restart.
MCU BOX #1
MCU PCB
OFF
ON
1 3 7 9 0 0
1
Branch A B C D E
0
F
Outdoor unit display
Indoor unit display
×
(Operation)
◑
(Timer)
◑
(Fan)
◑
(Filter)
×
(Defrost)
Criteria • Occurs when MCU PIPE is set as being used, yet not connected to an indoor unit.
Cause of problem • Pipe is not installed to the indoor unit with assigned address on MCU.
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