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.
MC
U
BO
X #1
M
C
U P
C
B
O
FF
ON
1
3
7
9
0
0
1
Bran
c
h
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.