Trouble Shooting - Mitsubishi Electric PLA-ZM EA-Serie Bedienungshandbuch

6. Care and Cleaning
Fri
Room
Cool Set temp. Auto
Mode Temp. Fan
If two or more indoor units are connected, filter cleaning timing for each
unit may be different, depending on the filter type.
The icon will appear when the filter on the main unit is due for
cleaning.
When the filter sign is reset, the cumulative operation time of all units
will be reset.
The icon is scheduled to appear after a certain duration of operation,
based on the premise that the indoor units are installed in a space with
ordinary air quality. Depending on the air quality, the filter may require
more frequent cleaning.
The cumulative time at which filter needs cleaning depends on the model.
• This indication is not available for wireless remote controller.

7. Trouble Shooting

Having trouble?
Air conditioner does not heat or cool well.
When heating operation starts, warm air does not blow from the indoor
unit soon.
During heating mode, the air conditioner stops before the set room
temperature is reached.
During cooling mode, the air conditioner stops when the set room tem-
perature is reached.
Airflow direction changes during operation or airflow direction cannot be
set.
When the airflow direction is changed, the vanes always move up and
down past the set position before finally stopping at the position.
A flowing water sound or occasional hissing sound is heard.
A cracking or creaking sound is heard.
The room has an unpleasant odor.
A white mist or vapor is emitted from the indoor unit.
Water or vapor is emitted from the outdoor unit.
" " appears in the remote controller display.
When the is displayed on the
Main display in the Full mode, the
system is centrally controlled and
the filter sign cannot be reset.
Caution:
• Ask authorized people to clean the filter.
■
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 completely
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.
• Indoor units are equipped with filters to remove the dust of sucked-
in air. Clean the filters using the methods shown in the following
sketches.
Here is the solution. (Unit is operating normally.)
■ Clean the filter. (Airflow is reduced when the filter is dirty or clogged.)
■ Check the temperature adjustment and adjust the set temperature.
■ Make sure that there is plenty of space around the outdoor unit. Is the
indoor unit air intake or outlet blocked?
■ Has a door or window been left open?
■ Warm air does not blow until the indoor unit has sufficiently warmed
up.
■ When the outdoor temperature is low and the humidity is high, frost
may form on the outdoor unit. If this occurs, the outdoor unit performs
a defrosting operation. Normal operation should begin after approxi-
mately 10 minutes.
■ For PLA-EA series, when the set room temperature is reached during
cooling mode, the fan operates at the lowest speed.
■ During heating mode, the vanes automatically move to the horizontal
airflow direction when the airflow temperature is low or during defrost-
ing mode.
■ When the airflow direction is changed, the vanes move to the set posi-
tion after detecting the base position.
■ These sounds can be heard when refrigerant is flowing in the air
conditioner or when the refrigerant flow is changing.
■ These sounds can be heard when parts rub against each due to
expansion and contraction from temperature changes.
■ The indoor unit draws in air that contains gases produced from the
walls, carpeting, and furniture as well as odors trapped in clothing,
and then blows this air back into the room.
■ If the indoor temperature and the humidity are high, this condition may
occur when operation starts.
■ During defrosting mode, cool airflow may blow down and appear like a
mist.
■ During cooling mode, water may form and drip from the cool pipes
and joints.
■ During heating mode, water may form and drip from the heat ex-
changer.
■ During defrosting mode, water on the heat exchanger evaporates and
water vapor may be emitted.
■ During central control, " " appears in the remote controller display
and air conditioner operation cannot be started or stopped using the
remote controller.
15