Indoor Unit - Mitsubishi Electric MSZ-AP25VG Service Manual

OPERATION INDICATOR
Abnormal
No. Operation indicator lamp
point
Upper lamp lights and lower lamp fl ashes.
MXZ type
Operation
1
mode
2.5-second OFF
setting
10-5. TROUBLE CRITERION OF MAIN PARTS
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
Vane motor (MV1)
(Horizontal Upper)
Vane motor (MV2)
(Horizontal Lower)
Vane motor (MV3)
(Vertical)
OBH788
Lit
Blinking
Not lit
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", "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 - SKY
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire
RED - SKY
Measure the resistance between the terminals with a tester.
(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 fi rst has
the priority.
Normal
262 - 328 Ω
Normal
257 - 333 Ω
Normal
219 - 273 Ω
25
Remedy
• Unify the operation mode.
Refer to outdoor unit service
manual.
Figure
SKY
ROTOR
SKY
RED
SKY SKY
BLK
ROTOR
BLK
RED
BLK
BLK