Mitsubishi Mr.SLIM MFZ-KA09NA Service Manual page 21

OPERATION INDICATOR
Abnormal
No.
Operation indicator lamp
point
Right lamp flash
MXZ type
Operation
1
mode
2.5-second OFF
setting
NOTE: When the indoor unit has started operation and the above failures are detected (the first detection after the power ON),
the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing.
9-5. TROUBLE JUDGEMENT CRITERIA OF MAIN PARTS
MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12 (MAIN1), RT13 (SUB)
RT14 (MAIN2), RT15 (MAIN3))
Indoor fan motor (Upper)
(MF1)
Indoor fan motor (Lower)
(MF2)
Damper lock motor
Right (ML1)
Damper lock motor
Left (ML2)
Horizontal vane
motor (MV1)
Damper motor
(MV2)
OBH568A
Lighted
· Flashing of OPERATION INDICATOR lamp (right-hand side lamp) indicates
abnormality.
Blinking
· OPERATION INDICATOR lamp (left-hand side lamp) is lighted.
Not lighted
Symptom
Outdoor unit
operates but
indoor unit
does not
operate.
Check method and criteria
Measure the resistance with a tester. (Part temperature: 10°C ~ 30°C)
Normal
8 kΩ ~ 20 kΩ
Check 9-6. -1.
Check 9-6. -2.
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Color of the lead wire Normal
BRN-other one 235 Ω ~ 255 Ω
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Color of the lead wire Normal
BRN-other one 235 Ω ~ 255 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)
BRN-other one (300 Ω)
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Color of the lead wire Normal
BRN-other one 282 Ω ~ 306 Ω
Check point
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 at
first has the priority.
Normal
235 Ω ~ 255 Ω
282 Ω ~ 306 Ω
21
Countermeasure
• Unify the operation mode.
Refer to outdoor unit
service manual.
Figure
RED
ROTOR
YLW
BRN
ORN GRN