Mitsubishi Electronics PFFY-NRMU-A, PDFY-NMU-A Troubleshooting, Regarding place for installation

6. 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
	Air flows out but it does	The liquid crystal display		adjustment], and operate the adjustment button.
			The filter is filled with dust and dirt.	Clean up the filter.
	not cool enough or heat	shows that it is in the
				(Refer to [Caring for the machine].)
	enough.	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.
				(To protect the compressor, a 3-minute restart-preventing
		The liquid crystal display	The restart-preventing circuit is in operation for 3 min-	circuit is built into the indoor unit. Therefore, there are occa-
	Cool air or warm air		utes.	sions sometimes when the compressor does not start run-
		shows that it is in opera-
	does not come out.			ning immediately. There are cases when it does not run for
		tion.
				as long as 3 minutes.)
GB
			Indoor unit operation was started anew during the heat-	Wait for a while.
			ing and defrosting operation.	(Heating operation starts after ending defrosting operation.)
		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].)
	The sound of the ex-		When other indoor units are engaged in cooling opera-
	haust and rotation of	All lights are out except
			tion, the machine stops after running a drain-up mecha-
	the motor can still be	the powered display of		Wait for 3 minutes.
			nism for 3 minutes when air-cooling operation is
	heard after stop of run-	“'”.
			stopped.
	ning.
	The sound of the ex-		When other indoor units are engaged in cooling opera-
	haust and the rotation	All lights are out except
			tion, drained water is brought in. If the drain water is	It soon stops. (If the noise occurs more than 2-3 times in an
	of the motor can be	the powered display of
			collected, the drain-up mechanism initiates a draining	hour, ask for repair service.)
	heard intermittently af-	“'”.
			operation.
	ter stop of running.
	Warm air comes out in-	The liquid crystal display	When other indoor units are engaged in heating op-
	termittently when the			It soon stops. (If the room temperature rises uncomfortably
		shows that it is in the	eration, the control valves are opened and closed from
	thermostat is OFF or			high in a small room, stop operation.)
		state of operation.	time to time to maintain the stability of the system.
	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

•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.

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

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.

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