Trouble Criterion Of Main Parts - Mitsubishi Electric MSZ-EF18VEW Service Manual

OPERATION INDICATOR
Abnormal
No.
point
Left lamp lights and lower lamp fl ashes.
MXZ type
Operation
1
mode
2.5-second OFF
setting

10-5. TROUBLE CRITERION OF MAIN PARTS

MSZ-EF18VEW MSZ-EF22VEW MSZ-EF25VEW MSZ-EF35VEW MSZ-EF42VEW MSZ-EF50VEW
MSZ-EF18VEB MSZ-EF22VEB MSZ-EF25VEB MSZ-EF35VEB MSZ-EF42VEB MSZ-EF50VEB
MSZ-EF18VES MSZ-EF22VES MSZ-EF25VES MSZ-EF35VES MSZ-EF42VES MSZ-EF50VES
MSZ-EF18VE2W MSZ-EF22VE2W MSZ-EF25VE2W MSZ-EF35VE2W MSZ-EF42VE2W MSZ-EF50VE2W
MSZ-EF18VE2B MSZ-EF22VE2B MSZ-EF25VE2B MSZ-EF35VE2B MSZ-EF42VE2B MSZ-EF50VE2B
MSZ-EF18VE2S MSZ-EF22VE2S MSZ-EF25VE2S MSZ-EF35VE2S MSZ-EF42VE2S MSZ-EF50VE2S
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
Vane motor (MV)
OBH589D
Operation indicator lamp
Measure the resistance with a tester.
Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control
P.C. board", for the chart of thermistor.
Check 10-6. "Check of indoor fan motor".
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire
RED - BLK
Symptom
The operation mode of the each indoor unit
Outdoor unit
is differently set to COOL (includes DRY) and
operates but
HEAT at the same time, the operation mode
indoor unit does
of the indoor unit that has operated at fi rst has
not operate.
the priority.
Check method and criterion
Normal
232 - 268 Ω
29
Condition
• Unify the operation mode.
Refer to outdoor unit service
manual.
Remedy
Figure
BLK
ROTOR
BLK
RED
BLK BLK