Mitsubishi Electric MSZ-FB25VA Operating Instructions Manual page 10

● OPERATING INSTRUCTIONS ●
W
HEN YOU THINK THAT TROUBLE HAS OCCURRED
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
Indoor Unit
• Is the breaker turned on?
The unit cannot be operated.
• Is the power supply plug connected?
• Is the ON timer set?
• Are the horizontal vanes installed correctly?
All LED lamps on the indoor
unit are blinking.
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The horizontal vane does not • Are the horizontal vane and the vertical vane
installed correctly?
move.
• Is the fan guard deformed?
The unit cannot be operated • This protects the unit according to instruc-
for about 3 minutes when
tions from the microprocessor. Please
wait.
restarted.
Mist is discharged from the air • The cool air from the unit rapidly cools mois-
outlet of the indoor unit. ture in the air inside the room, and it turns
into mist.
The swing operation of the • This is for the swing operation of the HORI-
HORIZONTAL VANE is ZONTAL VANE to be performed normally.
suspended for a while, then
restarted.
The air fl ow direction changes • When the unit is operated in COOL or DRY
mode, if the operation continues with air
during operation.
blowing down for 0.5 to 1 hour, the direction
The direction of the horizontal
vane cannot be adjusted with of the air fl ow is automatically set to position
(1) to prevent water from condensing and
the remote controller.
dripping.
• In the heating operation, if the air fl ow tem-
perature is too low or when defrosting is be-
ing done, the horizontal vane is automatically
set to horizontal position.
The operation is stopped for • Defrosting of the outdoor unit is being
about 10 minutes in the heat- done.
Since this is completed in max.10 minutes,
ing operation.
please wait. (When the outside temperature
is too low and humidity is too high, frost is
formed.)
• These models are equipped with an auto re-
The unit starts operation by
itself when the main power start function. When the main power is turned
off without stopping the unit with the remote
is turned on, though it isn't
operated with the remote
controller and is turned on again, the unit
controller. 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 5 .
• Is the CLEAN lamp lighted? When the
The operation does not stop,
or air is blown even when the
CLEAN lamp is lighted, CLEAN operation
ON/OFF button is pressed.
is performed. Page 7
CLEAN lamp is lighted. • CLEAN operation is performed. Page 7
Multi system
The indoor unit which is not
• A small amount of refrigerant continues to
operating becomes warm and fl ow into the indoor unit even though it is
a sound, similar to water fl ow-
not operating.
ing, is heard from the unit.
When heating operation is • When operation is started during defrosting
of outdoor unit is done, it takes a few minutes
selected, operation does not
start right away. (max. 10 minutes) to blow out warm air.
Outdoor Unit
• When the outside temperature is low dur-
The fan of the outdoor unit
does not rotate even though ing cooling operation, the fan operates
intermittently to maintain suffi cient cooling
the compressor is running.
Even if the fan starts to rotate, capacity.
it stops soon.
Water leaks from the outdoor • During COOL and DRY operations, pipe or
unit. pipe connecting sections are cooled and this
causes water to condense.
• In the heating operation, water condensed
on the heat exchanger drips down.
• In the heating operation, the defrosting op-
eration makes water frozen on the outdoor
unit melt and drip down.
En-9
Explanation & Check points
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Symptom
Outdoor Unit
White smoke is discharged
• In the heating operation, vapor generated
by the defrosting operation looks like white
from the outdoor unit.
smoke.
Remote controller
• Are the batteries exhausted?
The display on the remote
• Is the polarity (+, -) of the batteries correct?
controller does not appear
or it is dim. The indoor unit Page 3
does not respond to the • Are any buttons on the remote controller of
other electric appliances being pressed?
remote control signal.
Does not cool or heat
• Is the temperature setting appropriate?
The room cannot be cooled
or heated suffi ciently.
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• Is the fan setting appropriate? Please
change fan speed to higher setting.
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• Are the fi lters clean?
• 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
The room cannot be cooled
suffi ciently.
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.
• When the outside temperature is low, the
The room cannot be heated
suffi ciently. heating effect may not be suffi cient.
Air does not blow out soon in • Please wait as the unit is preparing to blow
out warm air.
the heating operation.
Airfl ow
• Are the fi lters clean?
The air from the indoor unit
• Is the fan or heat exchanger of the indoor unit
smells strange.
clean?
• The unit may suck in an odor adhering to the
wall, carpet, furniture, cloth, etc. and blow it
out with the air.
• During PLASMA operation, you may smell
ozone that is generated in small quantities
from the plasma electrode unit. This is not a
malfunction.
Sound
Cracking sound is heard. • This sound is generated by the expansion/
contraction of the front panel, etc. due to
change in temperature.
• This sound is heard when the outside air is
"Burbling" sound is heard.
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.
• This is the switching sound in turning on/off
Mechanical sound is heard
from the indoor unit. the fan or the compressor.
The sound of water fl owing
• This is the sound of refrigerant or condensed
water fl owing in the unit.
is heard.
Hissing sound is sometimes • This is the sound when the fl ow of refrigerant
inside the unit is switched.
heard.
In the following cases, stop using the air conditioner and consult your dealer.
• When water leaks or drips from the indoor unit.
• When the POWER 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.
Explanation & Check points
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