Mitsubishi Electric MCF-GA35VB Service Manual page 12

9-4. Trouble criterion of main parts
MCF-GA35VB -
E1
Part name
Room
Measure the resistance with a tester.
temperature
(Part temperature 10°C ~ 30°C)
thermistor (RT11)
Indoor coil
thermistor (RT12)
Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)
Indoor fan
Color of lead
motor wire
(MF)
WHT-BLK
BLK-YLW
INNER FUSE
145 i 5: CUT OFF
YLW-BLU
BLU-BRN
BRN-RED
Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)
Vane
motor
(MV)
9-5. Troubleshooting flow
Indoor fan does not operate.
Check of indoor fan motor
A
No
Are lead wires connected?
Reconnect the lead
wires.
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.
MCF-GA50VB -
Check method and criterion
Normal
8kΩ ~ 20kΩ
MCF-GA35VB
195 ~ 212Ω
44 ~ 48Ω
31 ~ 34Ω
42 ~ 47Ω
22 ~ 25Ω
Normal
329 ~ 357Ω
Turn OFF power supply.
Check connector (Fan motor) visually.
Yes
Is resistance 0 (short circuit) or ∞ (open circuit)?
Replace the indoor fan motor.
MCF-GA60VB -
E1
Abnormal
Open or short-circuit
Normal
MCF-GA50VB MCF-GA60VB
175 ~ 190Ω 80 ~ 88Ω
66 ~ 72Ω 44 ~ 49Ω
35 ~ 39Ω
45 ~ 50Ω
30 ~ 33Ω 43 ~ 47Ω
22 ~ 24Ω 13 ~ 15Ω
Abnormal
Open or short-circuit
Yes ( 0 or ∞ )
12
E1
Abnormal
Open or
BLK
short-circuit
RED
YLW
BRN
Is soldered point of the connector
correctly soldered?
Yes
Replace the indoor electronic control
P.C. board.
No
(others)
Figure
FUSE
GRN
YLW
YLW BLU BRN RED ORN
WHT
ROTOR
ORN GRN
No
Resolder it.