When You Think That Trouble Has Occurred - Mitsubishi Electric MSZ-LN18VGW Operating Instructions Manual

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 horizontal vane does not • Are the horizontal vane and the vertical vane
move. installed correctly?
• Is the fan guard deformed?
• When the breaker is turned on, the horizontal
vanes' position will be reset in about a minute.
After the reset has completed, the normal hori-
zontal vanes' operation resumes. The same is
true in the emergency cooling operation.
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 HORI- • This is for the swing operation of the HORIZON-
ZONTAL VANE is suspended for a TAL VANE to be performed normally.
while, then restarted.
When SWING is selected in • It is normal that the lower horizontal vane does
COOL/DRY/FAN mode, the not move when SWING is selected in COOL/
lower horizontal vane does not DRY/FAN mode.
move.
The airfl ow direction changes • When the unit is operated in COOL or DRY
during operation. mode, if the operation continues with air blow-
The direction of the horizontal ing down for 0.5 to 1 hour, the direction of the
vane cannot be adjusted with airfl ow is automatically set to upward position
the remote controller. to prevent water from condensing and dripping.
• In the heating operation, if the airfl ow tem-
perature is too low or when defrosting is being
done, the horizontal vane is automatically set
to horizontal position.
The operation stops for about • Outdoor unit is in defrost.
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, but hasn't received turned off without stopping the unit with the
sign from 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 two horizontal vanes touch Perform one of the following:
each other. The horizontal • Turn off and on the breaker. Make sure the hori-
vanes are in an abnormal posi- zontal vanes move to the correct "close position".
tion. The horizontal vanes do • Start and stop the emergency cooling operation
not return to the correct "close and make sure the horizontal vanes move to the
position". correct "close position".
In COOL/DRY mode, when the • When the room temperature deviates from the
room temperature reaches near set temperature, the indoor fan starts running
the set temperature, the outdoor according to the settings on the remote control-
unit stops, then the indoor unit ler.
operates at low speed.
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.
The operation indicator lamp is • Is the NIGHT MODE operation set?
dim. The unit does not beep.
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 does • When the outside temperature is low during
not rotate even though the com- cooling operation, the fan operates intermittently
pressor is running. Even if the to maintain suffi cient cooling capacity.
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 ice forming 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.
Explanation & Check points
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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?
The operation mode cannot be • Disable the OPERATION LOCK.
changed.
Does not cool or heat
The room cannot be cooled or • Is the temperature setting appropriate?
heated suffi ciently. Page 7
• Is the fan setting appropriate? Please change
fan speed to High or Super High.
• Are the fi lters clean?
• Is the fan or heat exchanger of the indoor unit clean?
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• 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.
• Is the NIGHT MODE operation set?
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 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 • Are the fi lters 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 front panel, etc. due to change in
temperature.
"Burbling" sound 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 • 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
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 changed.
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 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.
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The unit starts/stops the opera- • Is the weekly timer set?
tion by itself.
Wi-Fi interface
When error occurs during con- Refer to the SETUP MANUAL.
nection setup or operation. For SETUP MANUAL, please go to the website
below.
http://www.melcloud.com/Support
Explanation & Check points
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EN-16
EN