Mitsubishi Electronics PFD-P250500VM-A operation manual Troubleshooting

8. Troubleshooting

Before you ask for repair service, check the following points:
State of Machine	Remote Controller	Cause	Troubleshooting
	“'” display is not lit up	Power failure	Press the [ON/OFF] button after power restoration.
It does not run.	No display appears even	The power supply is turned OFF.	Turn the power supply ON.
	when the [ON/OFF] but-	The fuse in the power supply is gone.	Replace fuse.
	ton is pressed.	The earth leakage breaker is gone.	Put in the earth leakage breaker.
			After checking the set temperature and inlet temperature
		Improper temperature adjustment	on the liquid crystal display, refer to [Room temperature
	The liquid crystal display		adjustment], and operate the adjustment button.
Air flows out but it does		The filter is filled with dust and dirt.	Clean up the filter.
	shows that it is in the
not cool enough.			(Refer to [Caring for the machine].)
	state of operation.
		There are some obstacles at the air inlet and outlet of	Remove.
		the indoor and outdoor units.
		Windows and doors are open.	Close.
			Wait for a while.
	The liquid crystal display		(To protect the compressor, a 3-minute restart-preventing
Cool air does not come		The restart-preventing circuit is in operation for 3 min-	circuit is built into the indoor unit. Therefore, there are occa-
	shows that it is in opera-
out.		utes.	sions sometimes when the compressor does not start run-
	tion.
			ning immediately. There are cases when it does not run for
			as long as 3 minutes.)
				GB
	The “check” and check	There are some obstacles at the air inlet and outlet of	Rerun after removal
It runs briefly, but soon		the indoor and outdoor units.
	code flashes on the liquid
stops.		The filter is filled with dust and dirt.	Rerun after cleaning the filter. (Refer to [Caring for the ma-
	crystal display.
			chine].)

•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.

•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.

Regarding transfer of installation

•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:

When moving or reinstalling the unit, consult with your dealer. Defective in- stallation can result in electric shock, fire, etc.

Regarding noise

•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.

Maintenance and inspection

•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.

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