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8-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA
MSY-A15NA MSY-A17NA MSY-A24NA
Part name Check method and criterion Figure
Room temperature
thermistor(RT11)
Measure the resistance with a tester.
Refer to 8-7. "Test point diagram and voltage",
"Indoor electronic control P.C. board", the chart of thermistor..
Indoor coil thermistor
(RT12(MAIN),RT13(SUB))
Indoor fan motor(MF) Check 8-6. .
Horizontal vane
motor(MV)
MSZ-A09/12/15/17NA
MSY-A15/17NA
Measure the resistance between the terminals with a tester.
(Part temperature 50 ~ 86°F)
Color of the lead wire Normal
BRN-other one 235 ~ 255 Ω
Horizontal vane
motor(MV1)
Vertical vane
motor(MV2)
MSZ-A24NA
MSY-A24NA
Measure the resistance between the terminals with a tester.
(Part temperature 50 ~ 86°F)
Color of the lead wire Normal
BRN-other one 282 ~ 306 Ω
OPERATION INDICATOR
No.
Abnormal
point
Operation indicator lamp Symptom Condition Correspondence
1
MXZ type
Operation
mode
setting
Left lamp lights and lower lamp fl ashes.
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.
•
17
RED
YLW
BRN
ORN
GRN
ROTOR
RED
YLW
BRN
ORN
GRN
ROTOR