Caring For The Machine; How To Clean; Troubleshooting - Mitsubishi Electric P36NMHU-E-OA Manuel D'utilisation

4. Caring for the machine

Always have filter maintenance performed by a service person. 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 filter periodically.
The life of the filter depends on where the unit is installed and how it is
operated.

5. 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 when
It does not run.
the [ON/OFF] button is
pressed.
Air flows out but it does The liquid crystal display
not cool enough or heat shows that it is in the state
enough. of operation.
The liquid crystal display
Cool air or warm air does
shows that it is in
not come out.
operation.
The "CHECK" and check
It runs briefly, but soon
code flashes on the liquid
stops.
crystal display.
The sound of the exhaust
and rotation of the motor All lights are out except the
can still be heard after powered display of " ".
stop of running.
The sound of the exhaust
and the rotation of the
All lights are out except the
motor can be heard
powered display of " ".
intermittently after stop of
running.
Warm air comes out
The liquid crystal display
intermittently when the
shows that it is in the state
thermostat is OFF or
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.
The fan speed changes in spite of not changing the setting. Not to blow out cold air at the beginning of heating operation, the air conditioner automatically adjusts the
fan speed gradually from lower to the set speed. It also adjust its fan speed to protect the fan motor when return air temperature or fan speed excessively rises.
8

How to clean

Ask your dealer or an authorized company for cleaning methods.
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
minutes.
Indoor unit operation was restarted during the
heating 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
operation, the machine stops after running a drain-up
mechanism for 3 minutes when air-cooling operation
is stopped.
When other indoor units are engaged in cooling
operation, 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
operation, the control valves are opened and closed
from time to time to maintain the stability of the
system.
Troubleshooting
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 outlet
temperature on the liquid crystal display, refer to
[Preset temperature setting], 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 occasions sometimes when the
compressor does not start running 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
machine].)
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.)