MITSUBISHI ELECTRIC PSA012B722 - Manual (Page 16)

15
TROUBLE SHOOTING
Check the following items before requiring service.
THE UNIT DOES NOT WORK AT ALL
Is the power supply switch
turned off? Is there a blackout or is the
fuse blown? Is the leakage breaker
activated?
Dangerous. Immediately turn
off the power supply switch,
and contact your dealer.
Is sunlight or other strong
illumination striking the
receive unit? (wireless unit)
ON
OFF
Is the air filter clogged? Is the swing louver
horizontal (during
heating)?
If the swing
louver is
horizontal, the
airflow may not
reach down to
the floor. Are there any obstacles
blocking the air inlet
and outlet grill? • Is the direct daylight
coming into the room?
• Are there any
unexpected heat
sources in the
room?
• Are there too many
people in the room?
Is the unit in the
heating preparation
mode?
☞ See page 16
POOR COOLING OR HEATING POOR COOLING
If, after checking the items above, the air conditioner still does not operate normally or in the next cases, stop operating and contact your dealer.
• If the fuse and breaker blow frequently. • If water drips at cooling/dehumidifying operation. • If the operation or operation noise is abnormal.
• If the check indicator light flashes.
The phenomena mentioned below is not malfunction.
NO AIRFLOW AT HEATING
HOW TO MAINTAIN
Air filter tabs
When mounting, press the lever forward
untill it snaps. When morrting, snab the filter into the
tabs of inlet grille.
J Ceiling suspended (FDE)
1. Slide the lever of the inlet grille
backward ( direction) and open it
downwards.
2. Pressing the inlet grille, press the filter
to remove it from the tab and pull it
downwards.
Air filter is attached when the air conditioner is installed, so consult your dealer about
how to remove or clean it.
J Duct connected −High static pressure− (FDU, FDUS)
J Duct connected −Middle static pressure− (FDUM)
MAINTENANCE OF THE UNIT
AT THE END OF THE PERIOD OF USE
(after a long period of use)
AT THE BEGINNING OF THE PERIOD OF USE
(after a long unused period)
• Clean the unit by wiping with a piece of soft and dry cloth.
If the unit is very dirty, wipe it with a piece of cloth wet with
neutral detergent dissolved in lukewarm water and wipe it
off with clean water.
• Make sure to turn off the power supply.
The air conditioner consumes several tens of watts
electricity even if it is stopped.
• Clean the air filter and mount it.
• Clean the indoor/outdoor units.
• Make sure that there is no object blocking the airflow
around the inlet and outlet grille of the indoor/outdoor unit.
• Inspect the air filter. If it is dirty, clean and mount it.
• Turn on the power supply button for 6 hours before
starting the operation.
How to clean
1 Wash away for cleaning. If it is not so dirty, tap it or use
cleaner.
If it is very dirty, dissolve some neutral detergent in lukewarm
water (approximately 30°C), rinse the filter with it and wash
the detergent away completely.
2 After the air filter is dried, mount it to the main body and press
RESET button.
ATTENTION
• Do not dry by exposing the air filter to the direct sunlight or
using fire. Otherwise, the filter may be damaged.
• Do not operate the air conditioner with the filter removed.
Otherwise it may lead to trouble.
The air conditioning system
sounds as if water is
draining from it. Sounds of rustling or gurgling may be heard when the operation is started, when the compressor is activated/
deactivated during operation, or when the operation is stopped. These are the sounds of the refrigerant
flowing through the system.
Sounds of rustling or
gurgling may be heard from
a stopped indoor unit. These sounds can be heard when the air conditioning system is performing automatic control.
The supply air from the
indoor unit smells bad. The supply air from the indoor unit may smell bad if the smell of cigarettes, cosmetics and/or furniture has
saturated the air conditioning system.
White vapor is generated
from the indoor unit during
operation. White vapor may be generated during operation if the system is used in environment where oils and fats are
frequently used, such as in restaurants. In this case, consult the dealer and clean the heat exchanger.
The operation switched to
fan operation during cooling
operation. The operation may switch to fan operation automatically in order to avald frost being built up on the surface of
the heat exchanger. The operation will soon return to cooling operation.
The indoor fan does
not stop even when the
operation is stopped in
heating mode. The indoor unit fan may continue operating for 40 seconds in order to remove remaining heat in the indoor
unit.
CAUTION Do not turn off the power supply until the fan stops.
The air conditioning system
cannot start operating again
immediately after stopping. During the first 3 minutes after stopping operation, it is not possible to perform cooling, dehumidifying or
heating operation even if the ON/OFF button is pressed to indicate “operation.” This is because a circuit for
protecting the compressor is activated (the fan is operating during this period).
No air comes out during
dehumidifying operation.
The airflow volume cannot
be changed. During dehumidifying operation, the fan speed is automatically controlled in low speed/stop cycle in order to
avoid both drastic temperature drop and humidity rise.
The swing louver moves
without any operation. The swing louver automatically swings twice when the power supply switch is turned on. This is not a trouble.
The louveralso moves automatically to the horizontal position when “PREPARATION OF HEATING” is
displayed.
The outdoor unit discharges
water or steam during
heating operation. Water or steam is discharge during defrosting operation which removes frost built up on the surface of the
heat exchanger in the outdoor unit in heating mode.
The outdoor unit fan is not
running even when the
system is in operation. The fan speed is automatically controlled according to the ambient temperature. It may be stopped in high
ambient temperature in case of heating, and in low ambient temperature in case of coding. Also, the fan is
stopped during defrosting operation.
CAUTION The fan will suddenly begin to operate even if it is stopped. Do not insert finger and/or stick.
J Ceiling cassette −4 way Compact (600×600mm) − (FDTC)
1. Slide the inlet grille levers in the direction of the arrow ( ), and
open it downwards.
2. Release the inlet grille stopper.
3. Pull the filter towards you.
4. When the filter is put in place, insert the filter into the hooks on
the inlet grille, and be sure to return the stopper to its original
position.
5. When putting the inlet grille back in place, slide the levers in the
opposite direction and check to be sure that the grille does not
come open.
Hooks Hooks
Stopper