35
OPERATION INDICATOR
No. Abnormal
point
Operation indicator lamp
Symptom
Condition
Remedy
1
MXZ type
Operation
mode
setting
Upper lamp lights and lower lamp blinks.
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 first has
the priority.
• Unify the operation mode.
Refer to outdoor unit service
manual.
Lit
Blinking
Not lit
10-5. TROUBLE CRITERION OF MAIN PARTS
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)
Check 10-6. "Check of indoor fan motor".
MSZ-AP25/35/42/50VG
MSZ-AP25/35/42/50VGK
Horizontal vane motor
upper (MV1)
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire
Normal
RED - SKY
262 - 328 Ω
SKY
SKY
RED
SKY SKY
ROTOR
MSZ-AP25/35/42/50VG
MSZ-AP25/35/42/50VGK
Horizontal vane motor
lower (MV2)
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire
Normal
RED - SKY
257 - 333 Ω
MSZ-AP25/35/42/50VG
MSZ-AP25/35/42/50VGK
Vane motor (MV3)
(Vertical)
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire
Normal
RED - BLK
219 - 273 Ω
BLK
BLK
RED
BLK
BLK
ROTOR
MSZ-AP60/71VG
MSZ-AP60/71VGK
Horizontal vane motor
(MV1)
Vertical vane motor
(MV2)
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire
Normal
Horizontal vane motor (MV1)
RED - BLK
313 ~ 375 Ω
Vertical vane motor (MV2)
268 ~ 322 Ω
OBH788C