Indoor Unit - Mitsubishi Electric SUZ-M-VA Series Service Manual

OPERATION INDICATOR
Abnormal
No.
Operation indicator lamp
point
Right lamp blink
MXZ type
Operation
1
mode
2.5-second OFF
setting
11-5. TROUBLE JUDGEMENT CRITERIA OF MAIN PARTS
MFZ-KT25VG MFZ-KT35VG MFZ-KT50VG MFZ-KT60VG
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12 (MAIN 1), RT13 (SUB)
RT14 (MAIN 2), RT15 (MAIN 3))
Indoor fan motor (MF)
Horizontal vane motor
(MV1) FRONT
Horizontal vane motor
(MV2) BACK
Multi-flow vane motor
(MV3)
OBH843
Lit
Blinking
Not lit
Symptom
Outdoor unit
operates but

indoor unit

does not
operate.
Check method and criteria
Measure the resistance with a tester.
Refer to 11-7. "Test point diagram and voltage", "Indoor electronic control
P.C. board", for the chart of thermistor.
Check 11-6. "Check of indoor fan motor" and
electronic control P.C. board and indoor fan motor".
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Color of the lead wire
BRN-other one (250 Ω)
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Color of the lead wire
BRN-other one (250 Ω)
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Color of the lead wire
BRN-other one (350 Ω)
Condition
When 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
first has the priority.
"Check of indoor
Normal
219 Ω ~ 273 Ω
Normal
219 Ω ~ 273 Ω
Normal
306 Ω ~ 382 Ω
30
Remedy
• Select the same operation mode
for all the units.
Refer to the outdoor unit
service manual.
Figure
RED
ROTOR
YLW
BRN
ORN GRN