Trouble Judgement Criteria Of Main Parts - Mitsubishi Electric MLZ-KP09NA Service Manual

OPERATION INDICATOR

Abnormal

No.

Operation indicator lamp

point

Right lamp blink

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 blinking.

MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA

Part name

Room temperature

thermistor (RT11)

Indoor coil thermistor

(RT12,RT14,RT15 (MAIN),

RT13 (SUB))

Indoor fan motor

Float sensor (FS)

Drain pump (DP)

Horizontal vane

motor (MV1)

Vertical vane

motor (MV2)

OBH802A

Lit

· Blinking of OPERATION INDICATOR lamp (right-hand side lamp) indicates

abnormality.

Blinking

· OPERATION INDICATOR lamp (left-hand side lamp) is lighted.

Not lit

Symptom

Outdoor unit

operates but

indoor unit

does not

operate.

Check method and criteria

Measure the resistance with a tester.

[Part temperature 50°F - 86°F (10°C - 30°C)]

Normal

8 kΩ ~ 20 kΩ

Check 9-6.

.

Disconnect connector and check with a tester.

Check open or short according to the float position.

Float sensor

Float

position

Float

Normal

Short

Measure the resistance between the terminals with a tester.

[Part temperature 50°F - 86°F (10°C - 30°C)]

Color of the lead wire

BLUE-BLUE (Drain pump side)

RED-RED (Control P.C. board side)

Measure the resistance between the terminals with a tester.

[Part temperature 68°F - 86°F (20°C - 30°C)]

Color of the lead wire

Each phase 300Ω

RED-YLW

Measure the resistance between the terminals with a tester.

[Part temperature 68°F - 86°F (20°C - 30°C)]

Color of the lead wire

Each phase 300Ω

RED-YLW

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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 at

first has the priority.

Float sensor

Float

Open

Normal

520Ω ~ 620Ω

Normal

Normal

27

Remedy

• Unify the operation mode.

Refer to outdoor unit

service manual.

Figure

YLW

ROTOR

YLW

RED

YLW

YLW