Care And Cleaning; Troubleshooting - Mitsubishi Electric SEZ-A12AR Operation Manual

3. Care and cleaning

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4. Troubleshooting

Before you call out a repair man, check the following table to see whether there is a simple solution to your problem.
[for wired remote controller]
Problem
Unit does not cool or heat very well.
The unit stops operating before ar-
riving at the set temperature in the
heating mode.
A white mist is expelled from the in-
door unit.
The indicators of the remote control-
ler do not light up when operated.
The start and stop functions are not
available just after restarting the unit.
If none of the above apply, turn the main switch off and contact the dealer from whom you bought the air-conditioner, telling him the model name and the
nature of the problem. Do not try to fix the unit yourself.
In any of the following cases, turn off the main power switch and contact your local dealer for service:
• The operation lamp (in the remote controller) flashes.
• The switches do not work properly.
• The circuit breaker trips frequently (or the fuse blows frequently).
• Water has accidentally been splashed into the unit.
• Water leaks from the unit.
• Something is accidentally dropped into the air-conditioner.
• An unusual noise is heard during operation.
The following do not indicate any malfunction:
Odours: smells such as tobacco or cosmetic odours may persist after they have been sucked into the unit.
Sound of liquid flowing inside indoor unit: this can occur during or after operation and is simply the sound of refrigerant being circulated inside the unit.
Ticking sound coming from indoor unit: this can occur when cooling or heating has just begun or has just stopped. It is caused by the indoor unit shrinking
or expanding slightly due to the change in temperature.
NOTE: The refrigerant charged in the air conditioner is safe. Refrigerant normally does not leak, however, if refrigerant gas leaks indoors, and comes into contact
with the fire of a fan heater, space heater, stove, etc., harmful substances will be generated.
Be sure to ask the service representative whether there is refrigerant leakage or not when repairs are carried out.
A
Solution
Clean the filter.
Frost forms when the outdoor tem-
perature is low and humidity is high.
Wait for about 10 minutes for the frost
to melt.
This may occur just after the unit is
turned on when a high level of hu-
midity is present in the room.
Turn on the power switch. " " will be
displayed.
Wait about three minutes (operation
has stopped to prevent damage to
the air conditioner).
3.1. Cleaning the filters and the indoor unit
Cleaning the filters
• Clean the filters using a vacuum cleaner. If you do not have a vacuum
cleaner, tap the filters against a solid object to knock off dirt and dust.
• If the filters are especially dirty, wash them in lukewarm water. Take care
to rinse off any detergent thoroughly and allow the filters to dry com-
pletely before putting them back into the unit.
Caution:
• Do not dry the filters in direct sunlight or by using a heat source,
such as an electric heater: this may warp them.
• Do not wash the filters in hot water (above 50°C), as this may warp
them.
• Make sure that the air filters are always installed. Operating the
unit without air filters can cause malfunction.
Caution:
• Before you start cleaning, stop operation and turn OFF the power
supply.
• The air filter should be obtained locally. Be sure to check on the
location and the way of setting with the contractor when the unit
perform a trial run. (Example) The air filter should be attached to
the indoor unit's air intake (rear side of unit).
AAir intake
BFilter
Problem
"H0" is displayed in the remote con-
troller.
An error code is displayed in the re-
mote controller.
The operating display of the wireless
remote controller's receiver is flash-
ing.
Solution
An automatic startup test is being
performed (will last for about two min-
utes).
A self-diagnostic function is being
performed to preserve the air condi-
tioner.
* Do not attempt to make repairs
yourself. Turn the main switch off
and contact the dealer from whom
you bought the air conditioner. Pro-
vide him or her with the name of the
unit and the information displayed
in the remote controller.
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