Mitsubishi Mr.Slim MFZ-KA09NA - Trouble Judgement Criteria of Main Parts

21
OPERATION INDICATOR
Not lighted
Blinking
Lighted
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.
No.
SymptomOperation indicator lamp Check point
Countermeasure
Abnormal
point
1
MXZ type
Operation
mode
setting
Outdoor unit
operates but
indoor unit
does not
operate.
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.
• 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.
9-5. TROUBLE JUDGEMENT CRITERIA OF MAIN PARTS
MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA
RED
YLW
BRN
ORN
GRN
ROTOR
Part name FigureCheck method and criteria
Indoor fan motor (Upper)
(MF1)
Measure the resistance with a tester. (Part temperature: 10°C ~ 30°C)
Normal
8 kΩ ~ 20 kΩ
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12 (MAIN1), RT13 (SUB)
RT14 (MAIN2), RT15 (MAIN3))
Horizontal vane
motor (MV1)
Damper motor
(MV2)
Normal
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
235 Ω ~ 255 Ω
282 Ω ~ 306 Ω
BRN-other one (250 Ω)
BRN-other one (300 Ω)
Normal
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
235 Ω ~ 255 Ω
Color of the lead wire
BRN-other one
Normal
BRN-other one
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
235 Ω ~ 255 Ω
Color of the lead wire
Normal
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
282 Ω ~ 306 Ω
Color of the lead wire
BRN-other one
Indoor fan motor (Lower)
(MF2)
Check 9-6. -1.
Check 9-6. -2.
Damper lock motor
Right (ML1)
Damper lock motor
Left (ML2)
Color of the lead wire
OBH568A