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MFZ-KA50VA
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Mitsubishi Electric MFZ-KA50VA [13/30] When you think that trouble has occurred

BEFORE CONTACTING THE SERVICE REPRE-

SENTATIVE, CHECK THE FOLLOWING AGAIN

Question

The air conditioner cannot

be operated for about 3 min-

utes when restarted.

Cracking sound is heard.

The air from the indoor unit

smells strange.

The fan of the outdoor unit

does not rotate even though

the compressor is running.

Even if the fan starts to ro-

tate, it stops soon.

The sound of water flowing

is heard.

The sound as burbling is

heard.

The room cannot be cooled

sufficiently.

Mist is discharged from the

air outlet of the indoor unit.

Mechanical sound is heard

from the indoor unit.

The swing operation of the

HORIZONTAL VANE is sus-

pended for about 15 sec-

onds, then restarted.

Answer (not a malfunction)

• This protects the air conditioner according to in-

structions from the microprocessor. Please wait.

• This sound is generated by the expansion/con-

traction of the front panel, etc. due to change in

temperature.

• The air conditioner may suck in an odor adher-

ing to the wall, carpet, furniture, cloth, etc. and

blow it out with the air.

• When the outside temperature is low, the fan

may not operate to maintain sufficient cooling

capacity.

• This is the sound of refrigerant flowing inside

the air conditioner.

• This is the sound of condensed water flowing in

the heat exchanger.

• This is the sound of the heat exchanger defrost-

ing.

• This sound is heard when the outside air is ab-

sorbed from the drain hose in turning on the

range hood or the ventilation fan and that makes

water flowing in the drain hose spout out.

This sound is also heard when the outside air

blows into the drain hose in case the outside

wind is strong.

• When a ventilation fan or a gas cooker is used

in a room, the cooling load increases, resulting

in an insufficient cooling effect.

• When the outside air temperature is high, the

cooling effect may not be sufficient.

• The cool air from the air conditioner rapidly cools

moisture in the air inside the room, and it turns

into mist.

• This is the switching sound in turning on/off the

fan or the compressor.

• This is for the swing operation of the HORIZON-

TAL VANE to be performed normally.

WHEN YOU THINK THAT TROUBLE HAS OCCURRED

Question

The air conditioner cannot

be operated.

The room cannot be cooled

or heated sufficiently.

The air from the indoor unit

smells strange.

The display on the remote

controller does not appear

or it is dim. The indoor unit

does not respond to the re-

mote control signal.

When a power failure oc-

curs.

Check points

• Is the breaker turned on?

• Is the fuse blown?

• Is the ON timer set? (Page 10)

• Is there anything that block the normal opera-

tion of the damper? (Page 8)

• Is the temperature setting correct? (Page 7)

• Is the filter clean? (Page 11)

• Are there any obstacles blocking the air inlet or

outlet of the indoor or outdoor unit?

• Is a window or door open?

• Is the filter clean? (Page 11, 12)

• Are the batteries exhausted? (Page 5)

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

(Page 5)

• Are any buttons on the remote controller of other

electric appliances being pressed?

• Does the air conditioner start operating again?

If the air conditioner had operated before the

power failure, as these models are equipped with

an auto restart function, the air conditioner

should start operating again. (Refer to Descrip-

tion of “AUTO RESTART FUNCTION” on page

6.)

Question

The air flow direction

changes during operation.

The direction of the hori-

zontal vane cannot be ad-

justed with the remote con-

troller.

Water leaks from the out-

door unit.

White smoke is discharged

from the outdoor unit.

Air does not blow out soon

in the heating operation.

The operation is stopped

for about 10 minutes in the

heating operation.

Hissing sound is some-

times heard.

The room cannot be heated

sufficiently.

In a multi-unit system, the in-

door unit which is not oper-

ating becomes warm and a

sound, similar to water flow-

ing, is heard from the unit.

The air conditioner starts

the operation only with the

main power turned on,

though you do not operate

the unit with the remote

controller.

The damper opens and

closes automatically.

Answer (not a malfunction)

• When the air conditioner is operated in COOL

or DRY mode, if the operation continues with air

blowing down for 1 hour, the direction of the air

flow is automatically set to position (1) to pre-

vent condensed water from dropping.

• In the heating operation, if the air flow tempera-

ture is too low or when defrosting is being done,

the horizontal vane position is automatically set

to horizontal.

• The horizontal vane automatically moves in cer-

tain intervals to determine its position, and then

it returns to the set position.

• During COOL and DRY operations, pipe or pipe

connecting sections are cooled and this causes

water to condense.

• In the heating operation, the defrosting opera-

tion makes water frozen on the outdoor unit melt

and drip down.

• In the heating operation, water condensed on

the heat exchanger drips down.

• In the heating operation, vapor generated by the

defrosting operation looks like white smoke.

• Please wait as the air conditioner is preparing

to blow out warm air.

• Defrosting of the outdoor unit is being done (De-

frosting operation).

Since this is completed in 10 minutes, please

wait. (When the external temperature is too low

and humidity is too high, frost is formed.)

• This is the sound when the flow of refrigerant

inside the air conditioner is switched.

• When the outside air temperature is low, the

heating effect may not be sufficient.

• A small amount of refrigerant continues to flow

into the indoor unit even though it is not operat-

ing.

• These models are equipped with an auto restart

function. When the main power is turned off with-

out stopping the air conditioner with the remote

controller and is turned on again, the air condi-

tioner will start operation automatically in the

same mode as the one set with the remote con-

troller just before the shutoff of the main power.

• The damper is automatically controlled by a mi-

crocomputer according to the air flow tempera-

ture and operation time of the air conditioner.

Even if the above items are checked, when the air conditioner does not

recover from the trouble, stop using the air conditioner and consult your

dealer.

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

• When water leaks or drops from the indoor unit.

• When the left operation indicator lamp blinks.

• When the breaker trips frequently.

• The remote control signal may not be received in a room where an electronic

ON/OFF type fluorescent lamp (inverter-type fluorescent lamp, etc.) is used.

• Operation of the air conditioner may interfere with radio or TV reception in

areas where the reception is weak. An amplifier may be required for the af-

fected device.

• When thunder is heard, stop operation and disconnect the power supply plug

or turn off the breaker. Otherwise, the electrical parts may be damaged.

HM05B040_MFZ-KA_en.p65 05.4.6, 7:12 PM13

Mitsubishi Electric MFZ-KA50VA [13/30] When you think that trouble has occurred

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