Mitsubishi Electric MFZ-KJ09NA, Operating Instructions Manual, Page: 12 / 40

En-11
● OPERATING INSTRUCTIONS ●
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 Explanation & Check points
Indoor Unit
The unit cannot be operated. • Is the breaker turned on?
• Is the power supply plug connected?
• Is the ON timer set?
The unit cannot be operated for
about 3 minutes when restarted.
• This protects the unit according to instructions
from the microprocessor. Please wait.
Mist is discharged from the air
outlet of the indoor unit.
• The cool air from the unit rapidly cools moisture
in the air inside the room, and it turns into mist.
The swing operation of the
HORIZONTAL VANE is
suspended for a while, then
restarted.
• This is for the swing operation of the HORIZON-
TAL VANE to be performed normally.
The air fl ow direction changes
during operation.
The direction of the horizontal
vane/multi-fl ow vane cannot
be adjusted with the remote
controller.
• In the heating operation, if the air fl ow tem-
perature is too low or when defrosting is being
done, the horizontal vane is automatically set
to vertical position. The multi-fl ow vane is set to
the closed position.
• When the air conditioner is operated in COOL
or DRY mode, if the operation continues with air
blowing horizontally for 1 hour, the direction of
the air fl ow is automatically set to position (1)
to prevent condensed water from dropping. The
multi-fl ow vane is set to the closed position.
• The horizontal vane and the multi-fl ow vane
automatically moves in certain intervals to
determine its position, and then it returns to the
set position.
The operation is stopped for
about 10 minutes in the heating
operation.
• 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.)
The unit starts operation by
itself when the main power is
turned on, though it isn’t oper-
ated with the remote controller.
• These models are equipped with an auto
restart 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”. Page 5
The multi-fl ow vane opens and
closes automatically.
• The multi-fl ow vane is automatically controlled
by a microcomputer according to the air fl ow
temperature and operation time of the air con-
ditioner.
The indoor unit discolors over
time.
• Although plastic turns yellow due to the infl uence
of some factors such as ultraviolet light and
temperature, this has no effect on the product
functions.
Multi system
The indoor unit which is not
operating becomes warm and a
sound, similar to water fl owing,
is heard from the unit.
• A small amount of refrigerant continues to fl ow
into the indoor unit even though it is not operat-
ing.
When heating operation is
selected, operation does not
start right away.
• When operation is started during defrosting of
outdoor unit is done, it takes a few minutes (max.
10 minutes) to blow out warm air.
Outdoor Unit
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.
• When the outside temperature is low during
cooling operation, the fan operates intermittently
to maintain suffi cient cooling capacity.
Water leaks from the outdoor
unit.
• 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 operation
makes water frozen on the outdoor unit melt and
drip down.
White smoke is discharged from
the outdoor unit.
• In the heating operation, vapor generated by the
defrosting operation looks like white smoke. In the following cases, stop using the air conditioner and consult your dealer.
• When water leaks or drips from the indoor unit.
• When the left 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 amplifi er
may be required for the affected device.
• When an abnormal sound is heard.
• When any refrigerant leakage is found.
W
HEN YOU THINK THAT TROUBLE HAS OCCURRED
Symptom Explanation & Check points
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.
• Are the batteries exhausted? Page 4
• Is the polarity (+, -) of the batteries correct?
Page 4
• Are any buttons on the remote controller of other
electric appliances being pressed?
Does not cool or heat
The room cannot be cooled or
heated suffi ciently.
• Is the temperature setting appropriate?
Page 5
• Is the fan setting appropriate? Please change
fan speed to High or Super High. Page 6
• Is the air outlet selection is set to 1 FLOW? Set
it to 2 FLOW.
Page 6
• Is the fi lter clean? Page 10
• 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 depending on
the size of the room, the ambient temperature,
and the like.
The room cannot be cooled
suffi ciently.
• When a ventilation fan or a gas cooker is 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
suffi ciently.
• When the outside temperature is low, the heat-
ing effect may not be suffi cient.
Air does not blow out soon in
the heating operation.
• Please wait as the unit is preparing to blow out
warm air.
Airfl ow
The air from the indoor unit
smells strange.
• Is the fi lter clean? Page 10
• 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 panel, etc. due to change in
temperature.
The sound as burbling is heard. • This sound is heard when the outside air is
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 from
the indoor unit.
• This is the switching sound in turning on/off the
fan or the compressor.
The sound of water fl owing is
heard.
• This is the sound of refrigerant or condensed
water fl owing in the unit.
Hissing sound is sometimes
heard.
• This is the sound when the fl ow of refrigerant
inside the unit is switched.
Timer
Weekly timer does not operate
according to settings.
• Is the ON/OFF timer set? Page 8, 9
• Transmit the setting information of the weekly
timer to the indoor unit again. When the informa-
tion 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. Page 9
• 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.
Page 4
The unit starts/stops the opera-
tion by itself.
• Is the weekly timer set? Page 9
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