Mitsubishi Electric MLZ-KP09NA Service Manual

27
OPERATION INDICATOR
Not lit
Blinking
Lit
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 blinking.
Right lamp blink
No.
SymptomOperation indicator lamp Condition
Remedy
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
· Blinking 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
MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA
YLW
YLW
RED
YLW
YLW
ROTOR
Part name FigureCheck method and criteria
Indoor fan motor
Measure the resistance with a tester.
[Part temperature 50°F - 86°F (10°C - 30°C)]
Normal
8 kΩ ~ 20 kΩ
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12,RT14,RT15 (MAIN),
RT13 (SUB))
Horizontal vane
motor (MV1)
Measure the resistance between the terminals with a tester.
[Part temperature 68°F - 86°F (20°C - 30°C)]
Vertical vane
motor (MV2)
Measure the resistance between the terminals with a tester.
[Part temperature 68°F - 86°F (20°C - 30°C)]
Measure the resistance between the terminals with a tester.
[Part temperature 50°F - 86°F (10°C - 30°C)]
Normal
Each phase 300Ω
Color of the lead wire
Normal
Each phase 300Ω
Color of the lead wire
Check 9-6. .
Float sensor (FS)
Drain pump (DP)
Normal
BLUE-BLUE (Drain pump side)
RED-RED (Control P.C. board side)
520Ω ~ 620Ω
Color of the lead wire
RED-YLW
RED-YLW
Disconnect connector and check with a tester.
Check open or short according to the float position.
Float sensor Float sensor
Float
Float
Float
position
Normal Short Open
OBH802A
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Mitsubishi Electric MLZ-KP09NA Specifications

General

Cooling Capacity	9, 000 BTU/h
Refrigerant	R-410A
Indoor Unit Dimensions (W x H x D)	33-1/16 x 7-7/8 x 27-9/16 inches
Indoor Unit Weight	40 lbs
Outdoor Unit Dimensions (W x H x D)	31-1/2 x 21-5/8 x 11-1/4 inches
Outdoor Unit Weight	82 lbs
Noise Level (Outdoor)	49 dB
Noise Level (Outdoor Unit)	49 dB
Noise Level (Indoor)	24 dB(A) (Low) - 39 dB(A) (High)
Noise Level (Indoor Unit)	24 dB(A) (Low) - 39 dB(A) (High)