Before Contacting The Service Representative, Check The Following Again; When You Think That Trouble Has Occurred - Mitsubishi Electric MFZ-KA25VA Manual De Instrucciones

BEFORE CONTACTING THE SERVICE REPRE-
SENTATIVE, CHECK THE FOLLOWING AGAIN
Question Check points
The air conditioner cannot • Is the breaker turned on?
be operated. • 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)
The room cannot be cooled • Is the temperature setting correct? (Page 7)
or heated sufficiently. • 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?
The air from the indoor unit • Is the filter clean? (Page 11, 12)
smells strange.
The display on the remote • Are the batteries exhausted? (Page 5)
controller does not appear • Is the polarity (+, -) of the batteries correct?
or it is dim. The indoor unit (Page 5)
does not respond to the re- • Are any buttons on the remote controller of other
mote control signal. electric appliances being pressed?
When a power failure oc- • Does the air conditioner start operating again?
curs. 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.)
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.

WHEN YOU THINK THAT TROUBLE HAS OCCURRED

Question Answer (not a malfunction)
The air conditioner cannot • This protects the air conditioner according to in-
be operated for about 3 min- structions from the microprocessor. Please wait.
utes when restarted.
Cracking sound is heard. • This sound is generated by the expansion/con-
traction of the front panel, etc. due to change in
temperature.
The air from the indoor unit • The air conditioner may suck in an odor adher-
smells strange. ing to the wall, carpet, furniture, cloth, etc. and
blow it out with the air.
The fan of the outdoor unit • When the outside temperature is low, the fan
does not rotate even though may not operate to maintain sufficient cooling
the compressor is running. capacity.
Even if the fan starts to ro-
tate, it stops soon.
The sound of water flowing • This is the sound of refrigerant flowing inside
is heard. 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.
The sound as burbling is • This sound is heard when the outside air is ab-
heard. 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.
The room cannot be cooled • When a ventilation fan or a gas cooker is used
sufficiently. 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.
Mist is discharged from the • The cool air from the air conditioner rapidly cools
air outlet of the indoor unit. moisture in the air inside the room, and it turns
into mist.
Mechanical sound is heard • This is the switching sound in turning on/off the
from the indoor unit. fan or the compressor.
The swing operation of the • This is for the swing operation of the HORIZON-
HORIZONTAL VANE is sus- TAL VANE to be performed normally.
pended for about 15 sec-
onds, then restarted.
Question Answer (not a malfunction)
The air flow direction • When the air conditioner is operated in COOL
changes during operation. or DRY mode, if the operation continues with air
The direction of the hori- blowing down for 1 hour, the direction of the air
zontal vane cannot be ad- flow is automatically set to position (1) to pre-
justed with the remote con- vent condensed water from dropping.
troller. • 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.
Water leaks from the out- • During COOL and DRY operations, pipe or pipe
door unit. 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.
White smoke is discharged • In the heating operation, vapor generated by the
from the outdoor unit. defrosting operation looks like white smoke.
Air does not blow out soon • Please wait as the air conditioner is preparing
in the heating operation. to blow out warm air.
The operation is stopped • Defrosting of the outdoor unit is being done (De-
for about 10 minutes in the frosting operation).
heating 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.)
Hissing sound is some- • This is the sound when the flow of refrigerant
times heard. inside the air conditioner is switched.
The room cannot be heated • When the outside air temperature is low, the
sufficiently. heating effect may not be sufficient.
In a multi-unit system, the in- • A small amount of refrigerant continues to flow
door unit which is not oper- into the indoor unit even though it is not operat-
ating becomes warm and a ing.
sound, similar to water flow-
ing, is heard from the unit.
The air conditioner starts • These models are equipped with an auto restart
the operation only with the function. When the main power is turned off with-
main power turned on, out stopping the air conditioner with the remote
though you do not operate controller and is turned on again, the air condi-
the unit with the remote tioner will start operation automatically in the
controller. same mode as the one set with the remote con-
troller just before the shutoff of the main power.
The damper opens and • The damper is automatically controlled by a mi-
closes automatically. crocomputer according to the air flow tempera-
ture and operation time of the air conditioner.
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