Troubleshooting
Samsung Electronics
4-75
4-4-32 Setup Error for MCU Branch part – Setup Error for MCU Quantity Used
1. Inspection Method : Re-check the MCU quantity setup switch from the outdoor unit.
Check for overlaps in each MCU address setup switch.
To use, reset by pressing the K3 button of the outdoor unit after the reset is completed, or reset after turning off
the power and then turn it on again.
MC
U
BOX
#0
O
u
tdoor
U
nit
PCB
MC
U
PCB
O
FF
MC
U
Address
Set
u
p
MC
U
Address
Set
u
p
Set
u
p
for
I
ndoor
Qu
antity
U
sed
MC
U
Address
Set
u
p
Set
u
p
for
I
ndoor
Qu
antity
U
sed
ON
I
ndoor
U
nit
I
ndoor
U
nit
I
ndoor
U
nit
Address
Set
u
p
for
U
sing
Branch
Sphere
4
4
2
1
5
5
1
6
0
Branch
Sphere
A
4
B
C
D
E
5
F
6
MC
U
BOX
#
1
MC
U
PCB
O
FF
ON
1
3
7
9
0
0
1
Branch
Sphere
A B
D
E
0
7
F
1
MC
U
BOX
#0
O
u
tdoor
U
nit
PCB
MC
U
PCB
O
FF
MC
U
Address
Set
u
p
ON
I
ndoor
U
nit
Address
Set
u
p
for
U
sing
Branch
Sphere
4
4
2
1
5
5
1
6
0
Branch
Sphere
A
4
B
C
D
E
5
F
6
MC
U
BOX
#
1
MC
U
PCB
O
FF
ON
1
3
7
9
0
0
1
Branch
Sphere
A B
D
E
0
7
F
2
C
C
Outdoor unit display
Indoor unit display
×(Operation)
(Reservation)
(Blast)
(Filter) ×(Defrost)
Judgment Method
• Occurs when the quantity of MCU is incorrectly set by the outdoor unit.
• Occurs when same addresses are found when two or more MCU are connected.
Special Cause
• Outdoor unit MCU setup and same address errors when connecting two or more MCUs .
