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OPERATION INDICATOR
Not lighted
Blinking
Lighted
No.
SymptomOperation indicator lamp
Condition
Correspondence
Abnormal
point
1
MXZ type
Operation
mode
setting
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.
2.5-second OFF
Right lamp flash
· Flashing of OPERATION INDICATOR lamp (right-hand side lamp) indicates
abnormality.
· OPERATION INDICATOR lamp (left-hand side lamp) is lighted.
8-5. Trouble criterion of main parts
Part name FigureCheck method and criterion
Indoor fan motor(MF)
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.
Room temperature
thermistor(RT11)
Indoor coil thermistor
(RT12(MAIN), RT13(SUB))
Horizontal vane
motor(MV)
MSZ-A09/12/15/17NA
MSY-A15/17NA
Normal
BRN-other one
Measure the resistance between the terminals with a tester.
(Part temperature 50°F ~ 86°F)
235 " ~ 255 "
Color of the lead wire
Check 8-6. A.
Horizontal vane
motor(MV1)
Vertical vane
motor(MV2)
MSZ-A24NA
MSY-A24NA
Normal
BRN-other one
Measure the resistance between the terminals with a tester.
(Part temperature 50°F ~ 86°F)
282 " ~ 306 "
Color of the lead wire
RED
YLW
BRN
ORN
GRN
ROTOR
RED
YLW
BRN
ORN
GRN
ROTOR
MSZ-A09NA MSZ-A12NA MSZ-A15NA
MSZ-A17NA MSZ-A24NA
MSY-A15NA MSY-A17NA MSY-A24NA
OB450B-1.qxp 07.5.14 4:13 PM Page 17