Mitsubishi Electric MLZ-KY20VG 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
The unit cannot be operated.
The unit cannot be operated
for about 3 minutes when
restarted.
Mist is discharged from the air
outlet of the indoor unit.
The swing operation of the
HORIZONTAL VANE is
suspended for a while, then
restarted.
EN
The air fl ow direction changes
during operation.
The direction of the horizontal
vane cannot be adjusted with
the remote controller.
The operation is stopped for
about 10 minutes in the heat-
ing operation.
The unit starts operation by
itself when the main power
is turned on, though it isn't
operated with the remote
controller.
The indoor unit which is not
operating becomes warm and
a sound, similar to water fl ow-
ing, is heard from the unit.
The indoor unit discolors over
time.
Outdoor Unit (Multi system)
When heating operation is
selected, operation does not
start right away.
The fan of the outdoor unit
does not rotate even though
the compressor is running.
Even if the fan starts to rotate,
it stops soon.
Water leaks from the outdoor
unit.
White smoke is discharged
from the outdoor unit.
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.
Does not cool or heat
The room cannot be cooled or
heated suffi ciently.
EN-8
Explanation & Check points
• Is the breaker turned on?
• Is the ON timer set?
• This protects the unit according to instruc-
tions from the microprocessor. Please wait.
• The cool air from the unit rapidly cools mois-
ture in the air inside the room, and it turns
into mist.
• This is for the swing operation of the HORI-
ZONTAL VANE to be performed normally.
• 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.
• Defrosting of the outdoor unit is being done.
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.)
• 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".
• A small amount of refrigerant continues to
fl ow into the indoor unit even though it is not
operating.
• Although plastic turns yellow due to the infl u-
ence of some factors such as ultraviolet light
and temperature, this has no effect on the
product functions.
• When operation is started during defrosting
of outdoor unit is done, it takes a few minutes
(max. 10 minutes) to blow out warm air.
• When the outside temperature is low during
cooling operation, the fan operates intermit-
tently to maintain suffi cient cooling capacity.
• During COOL and DRY operations, pipe or
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.
• In the heating operation, vapor generated
by the defrosting operation looks like white
smoke.
• Are the batteries exhausted?
• Is the polarity (+, -) of the batteries correct?
• Are any buttons on the remote controller of
other electric appliances being pressed?
• Is the temperature setting appropriate?
• Is the fan setting appropriate? Please
change fan speed to Med. or High.
• 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?
• It may take a certain time to reach the setting
temperature or may not reach that depend-
ing on the size of the room, the ambient
temperature, and the like.
Symptom
Does not cool or heat
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.
Sound
Cracking sound is heard. • This sound is generated by the expansion/
contraction of the intake grille, 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.
Burbling sound is heard from • This is the sound of drained water fl owing
the indoor unit when DRY/ backward in the drain piping in the ceiling.
COOL operation is stopped.
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.
The sound of motor and • This is the sound of water condensed during
swirling sound is heard from COOL/DRY operation being drained from the
the indoor unit. indoor unit.
• Sound of water draining may also be heard
from indoor units which are not operating.
(The sound will stop automatically. Please
wait.)
Timer
Weekly timer does not oper- • Is the ON/OFF timer set?
ate according to settings.
• Transmit the setting information of the weekly
timer to the indoor unit again. When the infor-
mation is successfully received, a long beep
will sound from the indoor unit. If information
fails to be received, 3 short beeps will be
heard. Ensure information is successfully
received.
• When a power failure occurs and the main
power turns off, the indoor unit built-in clock
will be incorrect. As a result, the weekly timer
may not work normally.
Be sure to place the remote controller where
the signal can be received by the indoor unit.
The unit starts/stops the • Is the weekly timer set?
operation by itself.
Dirt
The ceiling and wall around • Please clean the periphery of the air condi-
the indoor unit get dirty. tioner frequently.
• It may prevent the dirt to lower the wind blow-
ing to the ceiling by adjusting the vertical wind
direction.
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.
• When any refrigerant leakage is found.
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Explanation & Check points