Trouble Shooting - Mitsubishi Heavy Industries FDT Manuel De L'utilisateur

HOW TO MAINTAIN
Ceiling cassette −4 way Compact (600×600mm) − (FDTC)
1. Slide the inlet grille levers in the direction of the arrow (
2. Release the inlet grille stopper.
Hooks
Hooks
3. Pull the filter towards you.
4. When the filter is put in place, insert the filter into the hooks on
5. When putting the inlet grille back in place, slide the levers in the
Stopper
Ceiling suspended (FDE)
1. Slide the lever of the inlet grille 2. Pressing the inlet grille, press the filter
to remove it from the tab and pull it
backward ( direction) and open it
downwards.
downwards.
Air filter
When mounting, press the lever forward When morrting, snab the filter into the
untill it snaps.
tabs of inlet grille.
Duct connected −High static pressure− (FDU, FDUS)
Duct connected −Middle static pressure− (FDUM)
Air filter is attached when the air conditioner is installed, so consult your dealer about
how to remove or clean it.
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.
), and
open it downwards.
the inlet grille, and be sure to return the stopper to its original
position.
opposite direction and check to be sure that the grille does not
come open.
Floor Standing (FDF)
Please take out the air filter by
pulling carefully the both side of the
inlet grille.
tabs
MAINTENANCE OF THE UNIT
• 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.
AT THE END OF THE PERIOD OF USE
(after a long period of use)
• 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.
AT THE BEGINNING OF THE PERIOD OF USE
(after a long unused period)
• 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.

TROUBLE SHOOTING

Check the following items before requiring service.
THE UNIT DOES NOT WORK AT ALL
Is the power supply switch Is there a blackout or is the
turned off? fuse blown?
ON
OFF
POOR COOLING OR HEATING
Is the air filter clogged? Is the swing louver Are there any obstacles
blocking the air inlet
horizontal (during
and outlet grill?
heating)?
If the swing
louver is
horizontal, the
airflow may not
reach down to
the floor.
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.
The air conditioning system Sounds of rustling or gurgling may be heard when the operation is started, when the compressor is activated/
sounds as if water is deactivated during operation, or when the operation is stopped. These are the sounds of the refrigerant
draining from it. flowing through the system.
Sounds of rustling or These sounds can be heard when the air conditioning system is performing automatic control.
gurgling may be heard from
a stopped indoor unit.
The supply air from the The supply air from the indoor unit may smell bad if the smell of cigarettes, cosmetics and/or furniture has
indoor unit smells bad. saturated the air conditioning system.
White vapor is generated White vapor may be generated during operation if the system is used in environment where oils and fats are
from the indoor unit during frequently used, such as in restaurants. In this case, consult the dealer and clean the heat exchanger.
operation.
The operation switched to The operation may switch to fan operation automatically in order to avald frost being built up on the surface of
fan operation during cooling the heat exchanger. The operation will soon return to cooling operation.
operation.
The indoor fan does The indoor unit fan may continue operating for 40 seconds in order to remove remaining heat in the indoor
not stop even when the unit.
operation is stopped in
CAUTION Do not turn off the power supply until the fan stops.
heating mode.
The air conditioning system During the first 3 minutes after stopping operation, it is not possible to perform cooling, dehumidifying or
cannot start operating again heating operation even if the ON/OFF button is pressed to indicate "operation." This is because a circuit for
immediately after stopping. protecting the compressor is activated (the fan is operating during this period).
No air comes out during During dehumidifying operation, the fan speed is automatically controlled in low speed/stop cycle in order to
dehumidifying operation. avoid both drastic temperature drop and humidity rise.
The airflow volume cannot
be changed.
The swing louver moves The swing louver automatically swings twice when the power supply switch is turned on. This is not a trouble.
without any operation. The louver also moves automatically to the horizontal position when "PREPARATION OF HEATING" is
displayed.
The outdoor unit discharges Water or steam is discharge during defrosting operation which removes frost built up on the surface of the
water or steam during heat exchanger in the outdoor unit in heating mode.
heating operation.
The outdoor unit fan is not The fan speed is automatically controlled according to the ambient temperature. It may be stopped in high
running even when the ambient temperature in case of heating, and in low ambient temperature in case of coding. Also, the fan is
system is in operation. stopped during defrosting operation.
CAUTION The fan will suddenly begin to operate even if it is stopped. Do not insert finger and/or stick.
Is the leakage breaker Is sunlight or other strong
activated? illumination striking the
receive unit? (wireless unit)
Dangerous. Immediately turn
off the power supply switch,
and contact your dealer.
POOR COOLING NO AIRFLOW AT HEATING
• Is the direct daylight Is the unit in the
coming into the room?
heating preparation
mode?
• Are there any
unexpected heat ☞
See page 16
sources in the
room?
• Are there too many
people in the room?
15