Troubleshooting; Installation, Transferring Works, And Checking - Mitsubishi Electric PFD-P250VM-A Operation Manual

8. 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.
The liquid crystal display
Air flows out but it does
shows that it is in the
not cool enough.
state of operation.
The liquid crystal display
Cool air does not come
shows that it is in opera-
out.
tion.
The "check" and check
It runs briefly, but soon
code flashes on the liquid
stops.
crystal display.
• 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 unit failures:
• The air blown out from the unit 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 unit.
• A hissing noise can be heard immediately after the unit is started or stopped. This is the sound of the refrigeration flowing inside the unit. This is normal.
• The unit sometimes snaps or clicks at the beginning or end of cooling 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.
• A white mist of steam may be emitted from the indoor unit when operation commences at high indoor temperature or humidity.

9. 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 unit where there is a risk of leakage of flammable gas.
If gas leaks and accumulates around the unit, fire can result.
Never install the unit 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
• Install the indoor unit horizontally. Otherwise, water leakage can result.
• Take sufficient measures against noise when installing the units at hospitals or
communication-related businesses.
If the unit is used in any of the above-mentioned environments, frequent opera-
tional failure can be expected. It is advisable to avoid these types of installation
sites.
For further details, consult with your dealer.
Regarding electrical work
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.
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.
There are some obstacles at the air inlet and outlet of
the indoor and outdoor units.
The filter is filled with dust and dirt.
•
•
Regarding transfer of installation
•
When moving or reinstalling the unit, consult with your dealer. Defective in-
stallation can result in electric shock, fire, etc.
Regarding noise
•
•
•
•
Maintenance and inspection
•
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.)
Rerun after removal
Rerun after cleaning the filter. (Refer to [Caring for the ma-
chine].)
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.
When removing and reinstalling the unit when you enlarge your home, re-
model, or move, consult with your dealer in advance to ascertain the cost of
the professional engineering work required for transferring the installation.
Caution:
In installing work, choose a place that can fully bear the weight of the unit, and
where noise and vibration can be reduced.
Choose a place where cool or warm air and noise from the outdoor air outlet of
the unit does not inconvenience the neighbors.
If any alien object is placed near the outdoor air outlet of the unit, decreased
performance and increased noise can result. Avoid placing any obstacles ad-
jacent to the air outlet.
If the unit produces any abnormal sound, consult with your dealer.
If the unit is used throughout several seasons, the insides can get dirty, reduc-
ing the performance.
Depending upon the conditions of usage, foul odors can be generated and
drainage can deteriorate due to dust and dirt, etc.
Troubleshooting
9