Mitsubishi Electric MSZ-EF09NAB Operating Instructions Manual page 11

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
installed correctly?
move.
• 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
from the microprocessor. Please wait.
about 3 minutes when restarted.
Mist is discharged from the air • The cool air from the unit rapidly cools moisture
in the air inside the room, and it turns into mist.
outlet of the indoor unit.
The swing operation of the HOR- • This is for the swing operation of the HORIZON-
TAL VANE to be performed normally.
IZONTAL VANE is suspended
for a while, then restarted.
When SWING is selected in • It is normal that the lower horizontal vane does
not move when SWING is selected in COOL/
COOL/DRY/FAN mode, the lower
DRY/FAN mode.
horizontal vane does not move.
The airfl ow direction changes • When the unit is operated in COOL or DRY
mode, if the operation continues with air blow-
during operation.
ing down for 0.5 to 1 hour, the direction of the
The direction of the horizontal
airfl ow is automatically set to upward position
vane cannot be adjusted with
to prevent water from condensing and dripping.
the remote controller.
• 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.
Since this is completed in max.10 minutes,
10 minutes in the heating
please wait. (When the outside temperature is
operation.
too low and humidity is too high, frost is formed.)
The unit starts operation by • These models are equipped with an auto
restart function. When the main power is
itself when the main power is
turned off without stopping the unit with the
turned on, but hasn't received
remote controller and is turned on again, the
sign from the remote control-
unit starts operation automatically in the same
ler.
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:
• Turn off and on the breaker. Make sure the hori-
each other. The horizontal vanes
zontal vanes move to the correct "close position".
are in an abnormal position. The
• Start and stop the emergency cooling operation
horizontal vanes do not return to
and make sure the horizontal vanes move to the
the correct "close position".
correct "close position".
The indoor unit discolors over • Although plastic turns yellow due to the infl uence
of some factors such as ultraviolet light and
time.
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
into the indoor unit even though it is not operat-
operating becomes warm and
ing.
a sound, similar to water fl ow-
ing, is heard from the unit.
When heating operation is • When operation is started during defrosting of
outdoor unit is done, it takes a few minutes (max.
selected, operation does not
10 minutes) to blow out warm air.
start right away.
Outdoor Unit
The fan of the outdoor unit • When the outside temperature is low during
cooling operation, the fan operates intermittently
does not rotate even though
to maintain suffi cient cooling capacity.
the compressor is running.
Even if the fan starts to rotate,
it stops soon.
Water leaks from the outdoor • During COOL and DRY operations, pipe or pipe
connecting sections are cooled and this causes
unit.
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 • In the heating operation, vapor generated by the
defrosting operation looks like white smoke.
from the outdoor unit.
Explanation & Check points
Page 7
Page 5
Symptom
Remote controller
The display on the remote • Are the batteries exhausted?
controller does not appear • Is the polarity (+, -) of the batteries correct?
Page 4
or it is dim. The indoor unit
• Are any buttons on the remote controller of other
does not respond to the
electric appliances being pressed?
remote control signal.
Does not cool or heat
The room cannot be cooled • Is the temperature setting appropriate?
or heated suffi ciently. Page 5
• 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?
• 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
• When a ventilation fan or a gas cooker is used
in a room, the cooling load increases, resulting
suffi ciently.
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
effect may not be suffi cient.
suffi ciently.
Air does not blow out soon in • Please wait as the unit is preparing to blow out
warm air.
the heating operation.
Airfl ow
The air from the indoor unit • Are the fi lters clean?
• Is the fan or heat exchanger of the indoor unit
smells strange.
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
fan or the compressor.
from the indoor unit.
The sound of water fl owing • This is the sound of refrigerant or condensed
water fl owing in the unit.
is heard.
Hissing sound is sometimes • This is the sound when the fl ow of refrigerant
inside the unit is changed.
heard.
Timer
Weekly timer does not oper- • Is the ON/OFF timer set?
ate 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.
Page 3
The unit starts/stops the • Is the weekly timer set?
operation 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 ampli-
fi er may be required for the affected device.
• When an abnormal sound is heard.
• When any refrigerant leakage is found.
Explanation & Check points
Page 4
Page 6
Page 9
Page 9
Page 7
Page 8
Page 8
En-10