Service manual

13
2. Trouble criterion of main parts
MCFZ-A12WV - MCFZ-A18WV - MCFZ-A24WV -
E1E1E1
Check of indoor fan motor
A
Indoor fan does not operate.
Turn OFF power supply.
Check connector (Fan motor) visually.
Replace the indoor fan motor.
Disconnect lead wires from connector (Indoor fan motor).
Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4 of the indoor fan
motor.
Are lead wires connected?
Reconnect the lead wires.
Is soldered point of the connector
correctly soldered?
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
Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)
Room
temperature
thermistor (RT11)
Part name
Indoor coil
thermistor (RT12)
Indoor fan
motor
(MF)
INNER FUSE
145 i 2: 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)
Open or
short-circuit
328
~ 356Ω
BLK RED ORNYLW BLU BRN
WHT
GRN
YLW
FUSE
Abnormal
Normal
Color of lead
wire
BRN-other
one
YLW
GRNORN
BRN
RED
ROTOR
Abnormal
Open or
short-circuit
MCFZ-A24WV
80~88Ω
44~49Ω
35~39Ω
43~47Ω
13~15Ω
Normal
MCFZ-A18WV
WHT-BLK
MCFZ-A12WV
79~87Ω175~190Ω
BLK-YLW 63~69Ω66~72Ω
YLW-BLU 34~38Ω45~50Ω
BLU-BRN 25~29Ω30~33Ω
BRN-RED 13~15Ω22~24Ω
Color of lead
wire
OB344A--1.qxp 04.6.14 1:04 PM Page 13