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Hen you think that trouble has occurred – MITSUBISHI ELECTRIC MR. SLIM MCF-D24VD User Manual

Page 8

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• OPERATING INSTRUCTIONS •

Even if these items are checked, when the unit does not recover from the

trouble, stop using the air conditioner and consult your dealer.

Symptom

Explanation & Check points

Indoor Unit
The unit cannot be operated.

• Is the breaker turned on?

• Is the power supply plug connected?

• Is the ON timer set?

Page 5

The unit cannot be operated

for about 3 minutes when

restarted.

• This protects the unit according to instruc-

tions from the microprocessor. Please

wait.

The fan stops during the DRY

operation.

• In DRY operation, the unit operates using

the same refrigerant circuit as in COOL

operation. DRY operation time has to be

reduced in order to lower humidity without

much room temperature decreasing. So

the compressor sometimes stops, and at

the same time the indoor fan stops. This

prevents water condensed on the heat

exchanger from evaporating again.

Mist is discharged from the air

outlet of the indoor unit.

• The cool air from the unit rapidly cools mois-

ture in the air inside the room, and it turns

into mist.

The swing operation of the

HORIZONTAL VANE is

suspended for a while, then

restarted.

• This is for the swing operation of the HORI-

ZONTAL VANE to be performed normally.

The air fl ow direction changes

during operation.

The direction of the horizontal

vane cannot be adjusted with

the remote controller.

• When the unit is operated in COOL or DRY

mode, if the operation continues with air

blowing down for 0.5 to 1 hour, the direction

of the air fl ow is automatically set to position

(1) to prevent water from condensing and

dripping.

The unit starts operation by

itself when the main power

is turned on, though it isn’t

operated with the remote

controller.

• These models are equipped with an auto re-

start function. When the main power is turned

off without stopping the unit with the remote

controller and is turned on again, the unit

starts operation automatically in the same

mode as the one set with the remote control-

ler just before the shutoff of the main power.

Refer to “Auto restart function”

page 4

.

Outdoor Unit
Water leaks from the outdoor

unit.

• During COOL and DRY operations, pipe or

pipe connecting sections are cooled and this

causes water to condense.

Symptom

Explanation & Check points

Remote controller
The display on the remote

controller does not appear

or it is dim. The indoor unit

does not respond to the

remote control signal.

• Are the batteries exhausted?

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• Is the polarity (+, -) of the batteries correct?

Page 3

• Are any buttons on the remote controller of

other electric appliances being pressed?

Does not cool
The room cannot be cooled

suffi ciently.

• Is the temperature setting appropriate?

Page 4

• Is the fan setting appropriate? Please

change fan speed to higher setting.

• Are the fi lter clean?

Page 6

• Is the fan or heat exchanger of the indoor unit

clean?

• Are there any obstacles blocking the air inlet

or outlet of the indoor or outdoor unit?

• Is a window or door open?

• When a ventilation fan or a gas cooker is

used in a room, the cooling load increases,

resulting in an insuffi cient cooling effect.

• When the outside temperature is high, the

cooling effect may not be suffi cient.

Airfl ow
The air from the indoor unit

smells strange.

• Are the fi lter clean?

Page 6

• Is the fan or heat exchanger of the indoor unit

clean?

• The unit may suck in an odor adhering to the

wall, carpet, furniture, cloth, etc. and blow it

out with the air.

Sound
Cracking sound is heard.

• This sound is generated by the expansion/

contraction of the front panel, etc. due to

change in temperature.

The sound as burbling is

heard.

• This sound is heard when the outside air is

absorbed from the drain hose by turning on

the range hood or the ventilation fan, making

water fl owing in the drain hose to spout out.

This sound is also heard when the outside air

blows into the drain hose in case the outside

wind is strong.

Mechanical sound is heard

from the indoor unit.

• This is the switching sound in turning on/off

the fan or the compressor.

The sound of water fl owing

is heard.

• This is the sound of refrigerant or condensed

water fl owing in the unit.

In the following cases, stop using the air conditioner and consult your

dealer.

• When water leaks or drips from the indoor unit.

• When the upper operation indicator lamp blinks.

• When the breaker trips frequently.

• The remote control signal is not received in a room where an electronic ON/OFF

type fl uorescent lamp (inverter-type fl uorescent lamp, etc.) is used.

• Operation of the air conditioner interferes with radio or TV reception. An ampli-

fi er may be required for the affected device.

• When an abnormal sound is heard.

W

HEN YOU THINK THAT TROUBLE HAS OCCURRED

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