Mitsubishi Electric MFZ-KJ50VE 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. • Is the breaker turned on?
• Is the power supply plug connected?
• Is the ON timer set?
The unit cannot be operated for • This protects the unit according to instructions
about 3 minutes when restarted. from the microprocessor. Please 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 HORIZON-
HORIZONTAL VANE is TAL VANE to be performed normally.
suspended for a while, then
restarted.
The air fl ow direction changes • In the heating operation, if the air fl ow tem-
during operation. perature is too low or when defrosting is being
The direction of the horizontal done, the horizontal vane is automatically set
vane/multi-fl ow vane cannot to vertical position. The multi-fl ow vane is set to
be adjusted with the remote the closed position.
controller. • 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 • Defrosting of the outdoor unit is being done.
about 10 minutes in the heating Since this is completed in max.10 minutes,
operation. 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
itself when the main power is
restart function. When the main power is
turned on, though it isn't oper-
turned off without stopping the unit with the
ated with the remote controller.
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"
The multi-fl ow vane opens and • The multi-fl ow vane is automatically control-
closes automatically. led by a microcomputer according to the air
fl ow temperature and operation time of the air
conditioner.
The indoor unit discolors over • Although plastic turns yellow due to the infl uence
time. 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 • A small amount of refrigerant continues to fl ow
operating becomes warm and a into the indoor unit even though it is not operat-
sound, similar to water fl owing, ing.
is heard from the unit.
When heating operation is • When operation is started during defrosting of
selected, operation does not outdoor unit is done, it takes a few minutes (max.
start right away. 10 minutes) to blow out warm air.
Outdoor Unit
The fan of the outdoor unit • When the outside temperature is low during
does not rotate even though the cooling operation, the fan operates intermittently
compressor is running. Even if to maintain suffi cient cooling capacity.
the fan starts to rotate, it stops
soon.
Water leaks from the outdoor • During COOL and DRY operations, pipe or pipe
unit. 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 • In the heating operation, vapor generated by the
the outdoor unit. defrosting operation looks like white smoke.
En-9
Explanation & Check points
page 4 .
Symptom
Remote controller
The display on the remote • Are the batteries exhausted?
controller does not appear or it
• Is the polarity (+, -) of the batteries correct?
is dim. The indoor unit does not
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respond to the remote control
• Are any buttons on the remote controller of other
signal.
electric appliances being pressed?
Does not cool or heat
The room cannot be cooled or • Is the temperature setting appropriate?
heated suffi ciently.
Page 4
• Is the fan setting appropriate? Please change
fan speed to higher setting.
• Is the air outlet selection is set to 1 FLOW? Set
it to 2 FLOW.
• 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 used
suffi ciently. 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 heat-
suffi ciently. ing effect may not be suffi cient.
Air does not blow out soon in • Please wait as the unit is preparing to blow out
the heating operation. 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 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 • This is the switching sound in turning on/off the
the indoor unit. fan or the compressor.
The sound of water fl owing is • This is the sound of refrigerant or condensed
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.
Timer
Weekly timer does not operate • Is the ON/OFF timer set?
according to settings.
• 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.
• 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.
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The unit starts/stops the opera- • Is the weekly timer set?
tion by itself.
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.
Explanation & Check points
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