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OPERATION INDICATOR
Abnormal
No.
point
Left lamp lights and lower lamp f ashes.
MXZ type
Operation
1
mode
2.5-second OFF
setting
10-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-SF15VA MSZ-SF20VA
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
Vane motor (MV)
OBH555D
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.
Refer to 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 - YLW
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 f rst has
not operate.
the priority.
Check method and criterion
Normal
223 - 268 Ω
23
Condition
• Unify the operation mode.
Refer to outdoor unit service
manual.
Remedy
Figure
YLW
ROTOR
YLW
RED
YLW
YLW
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