Before Contacting The Service Representative, Check The Following Again; When You Think That Trouble Has Occurred - Mitsubishi Electric MS-GA50VB Operating Instructions Manual

BEFORE CONTACTING THE SERVICE REPRE-
SENTATIVE, CHECK THE FOLLOWING AGAIN
Question Check points or Remedy
The air conditioner cannot • Is the breaker turned on?
be operated. • Is the fuse blown?
• Is the ON timer set? (Page 8)
The room cannot be cooled • Is the temperature setting correct? (Page 7)
or heated sufficiently. • Is the filter clean? (Page 10)
• 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 10)
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
• Are any buttons on the remote controller of other
remote control signal. electric appliances being pressed?
When a power failure occurs. • 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 Description
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 affected
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 structions from the microprocessor. Please wait.
minutes 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 adhering
smells strange. to the wall, carpet, furniture, cloth, etc. and blow
it out with the air.
The fan stops during the • In DRY operation, the unit operates using the
DRY operation. same refrigerant circuit as in COOL operation.
DRY operation time has to be reduced in order
to lower humidity without much room tempera-
ture decreasing. So the compressor sometimes
stops, and at the same time the indoor fan stops.
This prevents water condensed on the heat
exchanger from evaporating again.
The sound of water flowing
• This is the sound of refrigerant flowing inside the
is heard. air conditioner.
• This is the sound of condensed water flowing in
the heat exchanger.
• This is the sound of the heat exchanger defrosting.
The sound as burbling is
• This sound is heard when the outside air is
heard. absorbed from the drain hose in turning on the
range hood or the ventilation fan and that makes
water flowing in the drain hose sucked up.
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 cool air from the air conditioner rapidly cools
the air outlet of the indoor moisture in the air inside the room, and it turns
unit. 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 a ir f low di re c ti on • 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 flow is automatically set to horizontal to prevent
adjusted with the remote condensed water from dropping.
controller. • In the heating operation, if the air flow temperature is
too low or when defrosting is being done, the horizon-
tal vane position is automatically set to horizontal.
Question Answer (not a malfunction)
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 operation
makes water frozen on the outdoor unit melt and
drip down.
• In the heating operation, water drips from the heat
exchanger. This is not a malfunction. However, if
you have any trouble with water dripping, consult
your dealer for drainage work. Please note that
we cannot provide drainage work in such climate
that the outdoor unit may get frosted.
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
for about 10 minutes in the (Defrosting 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.
The swing operation of the • This is for the swing operation of the VERTICAL
VERTICAL VANE is VANE to be performed normally.
suspended for about 15
seconds, then restarted.
In a multi-unit system, the • A small amount of refrigerant continues to flow
indoor unit which is not op- into the indoor unit even though it is not operating.
erating becomes warm and a
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
function. When the main power is turned off with-
the 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 same
controller. mode as the one set with the remote controller just
before the shutoff of the main power.
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