16
8
TROUBLESHOOTING
8-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.
1).Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after
confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel,
the cabinet, the top panel and the electronic control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the
board with care NOT to apply stress on the components.
4) When connecting or disconnecting the connectors, hold the housing of the
connector. DO NOT pull the lead wires.
8-2. Instruction of trouble shooting
If indoor unit and outdoor unit doesn’t operate, please check of outdoor unit fuse F.
MU-A09WA MU-A12WA
Lead wiring
Housing point
MU-A09WA
Outdoor fan
motor (MF)
INNER
PROTECTOR
MU-A09WA
248
i
9°F OPEN
INNER
PROTECTOR
MU-A12WA
248
i
9°F OPEN
Measure the resistance between the terminals with a tester.
(Coil wiring temperature 14°F ~ 104°F)
Color of the
lead wire
Normal
WHT-BLK
BLK-RED
27~33
"
34~41
"
MU-A12WA
51~63
"
62~76
"
MU-A09WA
MU-A12WA
WHT
RED
BLK
AUX.
MAIN
WHT
ORN
RED
BLK
MAIN
AUX.
Fuse
Compressor (MC)
INNER
PROTECTOR
MU-A09WA
302
i
9°F OPEN
194
i
18°F CLOSE
MU-A12WA
338
i
9°F OPEN
194
i
18°F CLOSE
MU-A12WA-
311
i
9°F OPEN
194
i
18°F CLOSE
1
8-3.Trouble criterion of main parts
Part name
Check method and criterion
Measure the resistance between the terminals with a tester.
(Coil wiring temperature 14°F ~ 104°F)
Figure
RED
WHT
BLK
P
C
S
R
Color of the
lead wire
Normal
MU-A12WA
0.58~0.71
"
1.09~1.33
"
C-R
C-S
MU-A09WA
0.71~0.87
"
1.31~1.61
"
P
P
:INNER PROTECTOR
MU-A09WA
MU-A12WA
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