W Hen You Think That Trouble Has Occurred - Mitsubishi Electric Ecocore Ap 42 Series 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
• Is the breaker turned on?
The unit cannot be operated.
• 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
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.
White smoke is discharged from
• When the heating operation starts after the
the air inlet of the indoor unit. defrosting operation, vapor generated from the
condensation on the heat exchanger looks like
white smoke.
The swing operation of the horizon- • This is for the swing operation of the horizontal
tal vane is suspended for a while, vane to be performed normally.
then restarted.
When swing is selected in cool/ • It is normal that the lower horizontal vane does
dry/fan mode, the lower horizon- not move when swing is selected in cool/dry/fan
tal vane does not move. mode.
The airflow direction changes
• When the unit is operated in cool or dry mode,
during operation. if the operation continues with air blowing down
for 0.5 to 1 hour, the direction of the airflow is
The direction of the horizontal
vane cannot be adjusted with automatically set to upward position to prevent
the remote controller. water from condensing and dripping.
• In the heating operation, if the airflow tempera-
ture is too low or when defrosting is being done,
the horizontal vane is automatically set to hori-
zontal position. Also the fan speed decreases
or the fan stops.
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 off without stopping the unit with the
turned on, though it isn't oper-
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 two horizontal vanes touch Perform one of the following:
• Turn off and on the breaker. Make sure the hori-
each other. The horizontal
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
and make sure the horizontal vanes move to the
not return to the correct "close
position". correct "close position".
• Although plastic turns yellow due to the influence
The indoor unit discolors over
time. of some factors such as ultraviolet light and
temperature, this has no effect on the product
functions.
The ceiling and the walls around • It is because the ceiling and the walls get dust
the indoor unit have smudges. in the air due to air circulation by the air condi-
tioner.
Water leaks from the indoor • Is the front panel closed accurately?
• Does water flow smoothly from the edge of the
unit.
drain hose?
• Is the NIGHT MODE set?
The operation indicator lamp is
dim. The unit does not beep.
Multi System
• A small amount of refrigerant continues to flow
The indoor unit which is not
operating becomes warm and a into the indoor unit even though it is not operat-
sound, similar to water flowing,
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.
Explanation & Check Points
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Symptom
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
to maintain sufficient cooling capacity.
pressor is running. Even if the
fan starts to rotate, it stops soon.
Water leaks from the outdoor
• During cool and dry mode operations, pipe or
unit. 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 ice forming on the outdoor unit melt and
drip down.
White smoke is discharged from
• In the heating operation, vapor generated by the
defrosting operation looks like white smoke.
the outdoor unit.
Remote Controller
• Are the batteries exhausted?
The display on the remote
• Is the polarity (+, -) of the batteries correct?
controller does not appear or it
is dim. The indoor unit does not
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respond to the remote control
• Did you press the reset button after replacing
signal. the batteries?
• Is the setting of multiple indoor units' installation
the same as before replacing the batteries?
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• Are any buttons on the remote controller of other
electric appliances being pressed?
• The indoor unit may not receive the signal well
depending on the condition in the room. Get
close to the indoor unit and operate the remote
controller.
Does Not Cool or Heat
• Is the temperature setting appropriate?
The room cannot be cooled or
heated sufficiently.
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• Is the fan setting appropriate? Please change
fan speed to High or Super High.
• Are the filters 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.
• Is the NIGHT MODE set?
• When a ventilation fan or a gas cooker is used
The room cannot be cooled
sufficiently.
in a room, the cooling load increases, resulting
in an insufficient cooling effect.
• When the outside temperature is high, the cool-
ing effect may not be sufficient.
The room cannot be heated • When the outside temperature is low, the heat-
sufficiently. ing effect may not be sufficient.
Air does not blow out soon in • Please wait as the unit is preparing to blow out
the heating operation. warm air.
Poor cooling or heating perfor- • Do you have an arrangement with your electric
company for Demand Response?
mance.
Airflow
• Are the filters clean?
The air from the indoor unit
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 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
flowing 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.
• This is the switching sound in turning on/off the
Mechanical sound is heard from
the indoor unit. fan or the compressor.
The sound of water flowing is
• This is the sound of refrigerant or condensed
water flowing in the unit.
heard.
• This is the sound when the flow of refrigerant
Hissing sound is sometimes
heard. inside the unit is changed.
Heating operation stops and the • The outdoor unit is defrosting.
sound is heard. • Heating operation starts after the frost on the
outdoor unit has been removed. This can take
about 2 to 10 minutes.
• Cracking sound, Sound of water flowing ,Hiss-
ing sound and Whistling sound are heard.
Explanation & Check Points
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