Mitsubishi Electric MUFZ-KJ-NAHZ Series Service Manual page 27

OPERATION INDICATOR
Abnormal
No.
Operation indicator lamp
point
Right lamp flash
MXZ type
Operation
1
mode
2.5-second OFF
setting
9-5. TROUBLE JUDGEMENT CRITERIA OF MAIN PARTS
MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA
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)
Lighted
Blinking
Not lighted
Symptom
Outdoor unit
operates but
indoor unit
does not
operate.
Check method and criteria
Measure the resistance with a tester.
Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control
P.C. board", for the chart of thermistor.
Check 9-6. "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: 50°F - 86°F (10°C - 30°C))
Color of the lead wire
Measure the resistance between the terminals with a tester.
(Part temperature: 50°F - 86°F (10°C - 30°C))
Color of the lead wire
Measure the resistance between the terminals with a tester.
(Part temperature: 50°F - 86°F (10°C - 30°C))
Color of the lead wire
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
Normal
Normal
27
Remedy
• Select the same operation mode
for all the units.
Refer to the outdoor unit
service manual.
Figure
RED
ROTOR
YLW
BRN
ORN GRN