12
Check of indoor fan motor
A
Indoor fan does not operate.
Replace the indoor fan motor.
Disconnect lead wires from connector (Fan motor).
Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4 of the fan motor.
Are lead wires connected?
Reconnect the lead
wires.
Replace the indoor electronic control
P.C. board.
Resolder it.
Is resistance 0 (short circuit) or
∞
(open circuit)?
Yes ( 0 or
∞
)
No
(others)
Yes
No
Yes
No
Abnormal
Open or
short-circuit
MCF-GA60VB
80 ~ 88
Ω
44 ~ 49
Ω
35 ~ 39
Ω
43 ~ 47
Ω
13 ~ 15
Ω
Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)
Room
temperature
thermistor (RT11)
9-4. Trouble criterion of main parts
Part name
Indoor coil
thermistor (RT12)
Indoor fan
motor
(MF)
INNER FUSE
145
i
5
:
CUT OFF
Check method and criterion
Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)
Figure
Normal
8k
Ω
~ 20k
Ω
Abnormal
Open or short-circuit
Vane
motor
(MV)
Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)
BLK
RED ORN
YLW BLU BRN
WHT
GRN
YLW
FUSE
YLW
GRN
ORN
BRN
RED
ROTOR
Normal
MCF-GA50VB
WHT-BLK
MCF-GA35VB
175 ~ 190
Ω
195 ~ 212
Ω
BLK-YLW
66 ~ 72
Ω
44 ~ 48
Ω
YLW-BLU
45 ~ 50
Ω
31 ~ 34
Ω
BLU-BRN
30 ~ 33
Ω
42 ~ 47
Ω
BRN-RED
22 ~ 24
Ω
22 ~ 25
Ω
Color of lead
wire
MCF-GA35VB MCF-GA50VB MCF-GA60VB
Normal
329 ~ 357
Ω
Abnormal
Open or short-circuit
Turn OFF power supply.
Check connector (Fan motor) visually.
Is soldered point of the connector
correctly soldered?
9-5. Troubleshooting flow
OB382A.qxp 06.5.9 6:42 PM Page 12
