Mitsubishi Electric MSZ-DM25VA Service Manual page 21

OPERATION INDICATOR
Abnormal
No. Operation indicator lamp
point
Upper 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-DM25VA MSZ-DM35VA
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
Vane motor (MV)
OBH750
Symptom
Outdoor unit
operates but
indoor unit does
not operate.
Check method and criterion
Measure the resistance with a tester.
Refer to 10-7. "Test point diagram and voltage", "2. Indoor electronic control
P.C. board", for the chart of thermistor.
Check 10-6. .
Measure the resistance between the terminals with a tester.
(Part temperature 10 ~ 30°C)
Color of the lead wire
RED - BLK
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 f rst has
the priority.
Normal
235 ~ 255 Ω
21
Remedy
• Unify the operation mode.
Refer to outdoor unit service
manual.
Figure
BLK
ROTOR
BLK
RED
BLK BLK