Mitsubishi Electric Mr. Slim MSZ-FE09NA Service Manual page 26

OPERATION INDICATOR
L AREA R POWER
Abnormal
No. Operation indicator lamp
point
POWER lamp is lighted.
MXZ type
AREA lamps fl ash.
Operation
1 mode
setting 2.5-second OFF
MSZ-FE09/12NA
9-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA
Part name
Room temperature therm-
istor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
Horizontal vane motor
(MV1)
Vertical vane motor
(MV2)
i-see Sensor motor
(MT) (MSZ-FE09/12NA)
i-see Sensor (RR)
(MSZ-FE09/12NA)
Symptom
Outdoor unit
operates but
indoor unit does
not operate.
Check method and criterion
Measure the resistance with a tester.
Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C.
board", the chart of thermistor.
Check 9-6. .
Measure the resistance between the terminals with a tester.
(Part temperature 50 ~ 86°F (10 ~ 30°C))
Horizontal vane motor (MV1)
Vertical vane motor (MV2)
i-see Sensor motor (MT)
(MSZ-FE09/12NA)
Cover the i-see Sensor with black vinyl tape. Then, turn ON the power
supply. (i-see Sensor is energized.) Measure the voltage between connector
terminals of i-see Sensor with a tester.
(Part temperature 50 ~ 104°F (10 ~ 40°C))
i-see Sensor
i-see Sensor P.C. board
Black vinyl tape
i-see Sensor connector terminals
(GND) - (+)
(+) - (GND)
NOTE: Pay attention to static electricity.
Condition
The operation mode of the each indoor unit
is differently set to COOL (includes DRY) and
HEAT at the same time, the operation mode
of the indoor unit that has operated at fi rst has
the priority.
Color of the lead wire
(MSZ-FE09/12NA)
BRN-other one
(MSZ-FE18NA)
RED-BLK
Cover the i-see
4
Sensor with
3
black vinyl tape.
2(GND)
1
connector
Normal range
1.874 ~ 3.387 VDC
1.010 ~ 1.420 VDC
26
Remedy
• Unify the operation mode.
Refer to outdoor unit service
manual.
MSZ-FE09/12NA
RED
Normal
YLW
BRN
313 ~ 375 Ω
268 ~ 322 Ω
223 ~ 268 Ω MSZ-FE18NA
BLK
BLK
RED
Figure
ROTOR
ORN GRN
ROTOR
BLK
BLK