Mitsubishi Electric MLZ-KP09NA2 Operating Instructions Manual page 12

● 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 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 moisture
outlet of the indoor unit. 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
done, the horizontal vane is automatically set to
The direction of the horizontal
vane cannot be adjusted with horizontal position.
the remote controller.
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, please
operation. wait. (When the outside temperature is too low
and humidity is too high, frost is formed.)
The unit starts operation by itself
• These models are equipped with an auto
when the main power is turned restart function. When the main power is
on, though it isn't operated with turned off without stopping the unit with the
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 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 operating.
sound, similar to water fl owing,
is heard from the unit.
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.
Outdoor Unit (Multi system)
When heating operation is se- • When operation is started during defrosting of
lected, operation does not start outdoor unit is done, it takes a few minutes (max.
right away. 10 minutes) to blow out warm air.
The fan of the outdoor unit • When the outside temperature is low during cool-
does not rotate even though the ing operation, the fan operates intermittently to
compressor is running. Even if 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.
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
Page 3
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 5
• 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 depending on
the size of the room, the ambient temperature,
and the like.
En-11
Explanation & Check points
Page7
Page 5
Page 3
Page 9, 10
Page 9, 10
Symptom
Does not cool or heat
The room cannot be cooled • When a ventilation fan or a gas cooker is used in
suffi ciently. 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 heating
suffi ciently. 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/con-
traction of the intake grille, etc. due to change in
temperature.
The sound as burbling is heard. • This sound is heard when the outside air is ab-
sorbed 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 back-
the indoor unit when DRY/ ward in the drain piping in the ceiling.
COOL operation is stopped.
Mechanical sound is heard • This is the switching sound in turning on/off the
from the indoor unit. fan or the compressor.
The sound of water fl owing is • This is the sound of refrigerant or condensed water
heard. 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 swirl- • This is the sound of water condensed during
ing sound is heard from the COOL/DRY operation being drained from 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 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 information 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 incor-
rect. 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.
Dirt
The ceiling and wall around the • Please clean the periphery of the air conditioner
indoor unit get dirty. frequently.
• It may prevent the dirt to lower the wind blowing 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 amplifi er may
be required for the affected device.
• When an abnormal sound is heard.
• When any refrigerant leakage is found.
Explanation & Check points
Page 9, 10
Page 9, 10
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