24
8-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA MSZ-GC50NA MSZ-GC60NA MSZ-GC71NA
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", "2. Indoor electronic control
P.C. board", the chart of thermistor.
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
GC22/25
GC35NA-
C1
INNER FUSE
BA : 135
± 3°C CUT
OFF
CA : 140
± 2°C CUT
OFF
Motor part
Measure the resistance between the terminals with a tester.
(Part temperature 10 ~ 30°C)
Color of lead wire
Normal
WHT - BLK
273 ~ 296
Ω
BLK - RED
295 ~ 320
Ω
Sensor part
Measure the voltage power ON.
Color of lead wire
Normal range
BRN - YLW
4.5 ~ 5.5 V
BRN - GRY
(When fan revolved one time)
0 V 5 V 0 V
(Approx.)
Indoor fan motor (MF)
GC35NA-
C2
GC50/60/71
Check 8-6. .
GC22/25/35/50
Horizontal vane motor
(MV)
Measure the resistance between the terminals with a tester.
(Part temperature 10 ~ 30°C)
Color of the lead wire
Normal
RED - BLK
235 ~ 255
Ω
GC60/71
Horizontal vane motor
(MV1)
Vertical vane motor
(MV2)
Measure the resistance between the terminals with a tester.
(Part temperature 20 ~ 30°C)
Color of the lead wire
Normal
RED - BLK
240 ~ 260
Ω
BLK
RED
WHT
GR
Y
YL
W
BRN
MAIN
AUX.
FUSE
or
No. Abnormal
point
Operation indicator lamp
Symptom
Condition
Correspondence
1
GC22/25/35
/50
Attachment
of the hori-
zontal vane
All lamps
fl
ash at the same time.
0.5-second ON
0.5-second OFF
Indoor unit and
outdoor unit do
not operate.
The electricity is not conducted to the inter-
lock switch (Fan) of the horizontal vane.
Refer to 8-6. "Check of instal-
lation of the horizontal vane".
•
or
No.
Abnormal
point
Operation indicator lamp
Symptom
Condition
Correspondence
1
MXZ type
Operation
mode
setting
Upper or left lamp lights and lower or right
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.
•
RED
YLW
BRN
ORN
GRN
ROTOR
RED
YLW
BRN
ORN
GRN
ROTOR
