Troubleshooting; Installation, Transferring Works, And Checking - Mitsubishi Electric CITY MULTI PDFY-10NMU-A Manuel D'utilisation

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.

7. Installation, transferring works, and checking

Regarding place for installation
Consult with your dealer for details on installation and transferring the installation.
Caution:
Never install the air conditioner where there is a risk of leakage of flammable
gas.
If gas leaks and accumulates around the unit, fire can result.
Never install the air conditioner at the following place:
• where there is a lot of machine oil
• near the ocean and beach areas where there is salt air.
• where humidity is high
• where there are hot springs nearby
• where there is sulphurous gas
• where there is a high-frequency processing machinery (a high-frequency welder,
etc.)
• where acid solution is frequently used
• where special sprays are frequently used
8
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.
•
•
If the air conditioner is used in any of the above-mentioned environments, frequent
operational failure can be expected. It is advisable to avoid these types of installa-
tion sites.
For further details, consult with your dealer.
Regarding electrical work
•
•
•
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.)
Install the indoor unit horizontally. Otherwise, water leakage can result.
Take sufficient measures against noise when installing the air conditioners at
hospitals or communication-related businesses.
Caution:
The electrical work must be undertaken by a person who is qualified as
an electrical engineer according to the [technical standard respecting
electrical installation], [internal wiring rules], and the installation instruc-
tion manual with the absolute use of exclusive circuits. The use of other
products with the power source can result in burnt-out beakers and fuses.
Never connect the grounding wire to a gas pipe, water pipe, arrester, or
telephone grounding wire. For details, consult with your dealer.
In some types of installation sites, the installation of an earth leakage
breaker is mandatory. For details, consult with your dealer.
Troubleshooting