Mitsubishi Electric MSZ-AP71VG-E3 Service Manual page 38

OPERATION INDICATOR
Abnormal
No. Operation indicator lamp
point
Upper lamp lights and lower lamp blinks.
MXZ type
Operation
1
mode
2.5-second OFF
setting
10-5. TROUBLESHOOTING CRITERION OF MAIN PARTS
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
MSZ-AP25/35/42/50VG
MSZ-AP25/35/42/50VGK
Horizontal vane motor
upper (MV1)
MSZ-AP25/35/42/50VG
MSZ-AP25/35/42/50VGK
Horizontal vane motor
lower (MV2)
MSZ-AP25/35/42/50VG
MSZ-AP25/35/42/50VGK
Vane motor (MV3)
(Vertical)
MSZ-AP60/71VG
MSZ-AP60/71VGK
Horizontal vane motor
(MV1)
Vertical vane motor
(MV2)
*SKY = SKY BLUE
OBH788E
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 - SKY*
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Horizontal vane motor (MV1)
Vertical vane motor (MV2)
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 first has
the priority.
Normal
262 - 328 Ω
Normal
257 - 333 Ω
Normal
219 - 273 Ω
Color of the lead wire
313 ~ 375 Ω
RED - BLK
268 ~ 322 Ω
38
Remedy
• Unify the operation mode.
Refer to outdoor unit service
manual.
Figure
SKY
ROTOR
SKY
RED
SKY
BLK
ROTOR
Normal
BLK
RED
BLK
SKY
BLK