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9 TROUBLESHOOTING
MUM18NW
9-1 Cautions on troubleshooting
9-1-1 Before troubleshooting, check the followings:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
9-1-2 Take care the followings during servicing.
1) Befor servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after
confirming the horizontal vane is closed, disconnect the breaker.
2) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.
3) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Measure the resistance between the terminals with a tester.
(Coil wiring temperature-10¡C ~ 40¡C)
Measure the resistance between the terminals with a tester.
(Coil wiring temperature-10¡C ~ 40¡C)
Part name
Compressor
Outdoor fan
motor
Check method and criterion Figure
Normal
0.86~1.06'
Opened or
short-circuited
C-R
C-S 1.94~2.39'
Abnormal
Normal
17.6~21.6'
Opened or
short-circuited
WHT-BLK
BLK-YLW
YLW-RED
9.1~11.3'
9.1~11.3'
Abnormal
BLK
REDYLW ORN
WHT
P
9-2 Trouble criterion of main parts
OB202-1.qxp 26/9/97 11:07 AM Page 12