22
OPERATION INDICATOR
No.
Abnormal
point
Operation indicator lamp
Symptom
Condition
Correspondence
1
MXZ type
Operation
mode
setting
Upper lamp lights and lower lamp
fl
ashes.
2.5-second OFF
Outdoor unit
operates but
indoor unit does
not operate.
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.
Unify the operation mode.
Refer to outdoor unit service
manual.
•
10-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-SF15VA MSZ-SF20VA
Part name
Check method and criterion
Figure
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
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.
Indoor fan motor (MF)
Refer to 10-6. "Check of indoor fan motor."
Vane motor (MV)
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire
Normal
RED - YLW
223 - 268
Ω
YLW
YLW
RED
YLW
YLW
ROTOR
