Service manual

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-A24WV
80 ~ 88Ω
44 ~ 49Ω
35 ~ 39Ω
43 ~ 47Ω
13 ~ 15Ω
Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)
Room
temperature
thermistor (RT11)
2. 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
8kΩ ~ 20kΩ
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 ORNYLW BLU BRN
WHT
GRN
YLW
FUSE
YLW
GRNORN
BRN
RED
ROTOR
Normal
MCF-A18WV
WHT-BLK
MCF-A12WV
175 ~ 190Ω195 ~ 212Ω
BLK-YLW
66 ~ 72Ω44 ~ 48Ω
YLW-BLU 45 ~ 50Ω31 ~ 34Ω
BLU-BRN
30 ~ 33Ω42 ~ 47Ω
BRN-RED
22 ~ 24Ω22 ~ 25Ω
Color of lead
wire
MCF-A12WV - MCF-A18WV - MCF-A24WV -
E1E1E1
Normal
329 ~ 357Ω
Abnormal
Open or short-circuit
Turn OFF power supply.
Check connector (Fan motor) visually.
Is soldered point of the connector
correctly soldered?
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