When You Think That Trouble Has Occurred - Mitsubishi Electric MSZ-FD25VA Operating Instructions Manual

● 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
The unit cannot be operated. • Is the breaker turned on?
• Is the power supply plug connected?
• Is the ON timer set?
All LED lamps on the indoor • Are the horizontal vanes installed correctly?
unit are blinking. Page 8
The horizontal vane does not • Are the horizontal vane and the vertical vane
move. installed correctly?
• 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
restarted. wait.
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
during operation. mode, if the operation continues with air
The direction of the horizontal blowing down for 0.5 to 1 hour, the direction
vane cannot be adjusted with of the air fl ow is automatically set to position
the remote controller. (1) to prevent water from condensing and
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.
ing operation. Since this is completed in max.10 minutes,
please wait. (When the outside temperature
is too low and humidity is too high, frost is
formed.)
The unit starts operation by • These models are equipped with an auto re-
itself when the main power start function. When the main power is turned
is turned on, though it isn't off without stopping the unit with the remote
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"
The operation does not stop, • Is the CLEAN lamp lighted? When the
or air is blown even when the CLEAN lamp is lighted, CLEAN operation
ON/OFF button is pressed. is performed.
CLEAN lamp is lighted. • CLEAN operation is performed.
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
selected, operation does not of outdoor unit is done, it takes a few minutes
start right away. (max. 10 minutes) to blow out warm air.
Outdoor Unit
The fan of the outdoor unit • When the outside temperature is low dur-
does not rotate even though ing cooling operation, the fan operates
the compressor is running. intermittently to maintain suffi cient cooling
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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page 5 .
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Symptom
Outdoor Unit
White smoke is discharged • In the heating operation, vapor generated
from the outdoor unit. by the defrosting operation looks like white
smoke.
Remote controller
The display on the remote • Are the batteries exhausted?
controller does not appear • Is the polarity (+, -) of the batteries correct?
or it is dim. The indoor unit Page 3
does not respond to the • Are any buttons on the remote controller of
remote control signal. other electric appliances being pressed?
Does not cool or heat
The room cannot be cooled • Is the temperature setting appropriate?
or heated suffi ciently. Page 5
• Is the fan setting appropriate? Please
change fan speed to higher setting.
Page 6
• Is the fi lter 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?
The room cannot be cooled • When a ventilation fan or a gas cooker is
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.
The room cannot be heated • When the outside temperature is low, the
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
the heating operation. out warm air.
Airfl ow
The air from the indoor unit • Is the fi lter clean?
smells strange. • 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.
• 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.
The sound as burbling is • This sound is heard when the outside air 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.
Mechanical sound is heard • This is the switching sound in turning on/off
from the indoor unit. the fan or the compressor.
The sound of water fl owing • This is the sound of refrigerant or condensed
is heard. water fl owing in the unit.
Hissing sound is sometimes • This is the sound when the fl ow of refrigerant
heard. inside the unit is switched.
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.
Explanation & Check points
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