Caring For The Machine; Troubleshooting - Mitsubishi Electric CITY MULTI PEFY-P-VML-A Manuel D'utilisation

Prevent intrusion of heat during air-cooling
• To prevent the intrusion of heat during cooling operation, provide a curtain or a
blind on the window to block out direct sunlight. Also, do not open the entrance
or exit except in cases of dire necessity.

5. Caring for the machine

Before care-taking, turn the power supply OFF.
Caution:
• Before you start cleaning, stop operation and turn OFF the power supply.
Remember that the fan is rotating inside at high speed, posing a serious
risk of injury.
• 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. (The
standard filter should normally be cleaned once a week, and the long-life
filter at the beginning of each season.)
• The life of the filter depends on where the unit is installed and how it is
operated.

6. Troubleshooting

Before you ask for repair service, check the following points:
State of Machine Remote Controller
"'" display is not lit up
No display appears even
It does not run.
when the [ON/OFF] but-
ton is pressed.
Air flows out but it does The liquid crystal display
not cool enough or heat shows that it is in the
enough. state of operation.
The liquid crystal display
Cool air or warm air
shows that it is in opera-
does not come out.
tion.
The "check" and check
It runs briefly, but soon
code flashes on the liquid
stops.
crystal display.
The sound of the ex-
haust and rotation of All lights are out except
the motor can still be the powered display of
heard after stop of run- "'".
ning.
The sound of the ex-
haust and the rotation All lights are out except
of the motor can be the powered display of
heard intermittently af- "'".
ter stop of running.
Warm air comes out in-
The liquid crystal display
termittently when the
shows that it is in the
thermostat is OFF or
state of operation.
during fan operation.
• If operation stops due to a power failure, the [restart-preventing circuit at power failure] operates and disables unit operation even after power restoration. In this case,
press the [ON/OFF] button again and start operation.
If malfunctions persist after you have checked the above, turn the power supply OFF and contact your dealer with information about the product name, the nature of the
malfunction, etc. If the display of "[check]" and (4 digit) check code flashes, tell the dealer contents of the display (check code). Never attempt to repair by yourself.
The following symptoms are not air conditioner failures:
• The air blown out from the air conditioner can sometimes give off odors. This is due to cigarette smoke contained in the air of the room, the smell of cosmetics, the walls,
furniture, etc., absorbed in the air conditioner.
• A hissing noise can be heard immediately after the air conditioner is started or stopped. This is the sound of the refrigeration flowing inside the air conditioner. This is
normal.
• The air conditioner sometimes snaps or clicks at the beginning or end of cooling/heating operation. This is the sound of friction on the front panel and other sections due
to expansion and contraction caused by temperature change. This is normal.
Carry out ventilation sometimes
•
How to clean
•
•
•
Never pour water or flammable sprays onto the air conditioner. Cleaning using
these methods can result in the failure of the air conditioner, electric shock,
or fire.
Cause
Power failure
The power supply is turned OFF.
The fuse in the power supply is gone.
The earth leakage breaker is gone.
Improper temperature adjustment
The filter is filled with dust and dirt.
There are some obstacles at the air inlet and outlet of
the indoor and outdoor units.
Windows and doors are open.
The restart-preventing circuit is in operation for 3 min-
utes.
Indoor unit operation was started anew during the heat-
ing and defrosting operation.
There are some obstacles at the air inlet and outlet of
the indoor and outdoor units.
The filter is filled with dust and dirt.
When other indoor units are engaged in cooling opera-
tion, the machine stops after running a drain-up mecha-
nism for 3 minutes when air-cooling operation is
stopped.
When other indoor units are engaged in cooling opera-
tion, drained water is brought in. If the drain water is
collected, the drain-up mechanism initiates a draining
operation.
When other indoor units are engaged in heating op-
eration, the control valves are opened and closed from
time to time to maintain the stability of the system.
Since the air periodically gets dirty in a room that is kept closed for a long time,
ventilation is sometimes necessary. When gas appliances are used together
with the air conditioner, special precautions must be taken. If the "LOSSNAY"
ventilation unit developed by our company is used, you can perform ventilation
with less waste. For details on this unit, consult with your dealer.
Clear dust away lightly or clean it up with a vacuum cleaner. In the case of
severe staining, wash the filter in lukewarm water mixed with dissolved neutral
detergent or water, and then rinse off the detergent completely. After washing,
dry it and fix it back into place.
Caution:
Do not dry the filter by exposing it to direct sunlight or warming it using
fire, etc. Doing so can result in the deformation of the filter.
Washing it in hot water (more than 50
Caution:
Press the [ON/OFF] button after power restoration.
Turn the power supply ON.
Replace fuse.
Put in the earth leakage breaker.
After checking the set temperature and inlet temperature
on the liquid crystal display, refer to [Room temperature
adjustment], and operate the adjustment button.
Clean up the filter.
(Refer to [Caring for the machine].)
Remove.
Close.
Wait for a while.
(To protect the compressor, a 3-minute restart-preventing
circuit is built into the indoor unit. Therefore, there are occa-
sions sometimes when the compressor does not start run-
ning immediately. There are cases when it does not run for
as long as 3 minutes.)
Wait for a while.
(Heating operation starts after ending defrosting operation.)
Rerun after removal
Rerun after cleaning the filter. (Refer to [Caring for the ma-
chine].)
Wait for 3 minutes.
It soon stops. (If the noise occurs more than 2-3 times in an
hour, ask for repair service.)
It soon stops. (If the room temperature rises uncomfortably
high in a small room, stop operation.)
°
C) can also result in deformation.
Troubleshooting
11