Mitsubishi Electronics MCF-18TN/24TN manual When a power failure Occurs, Answer not a malfunction

BEFORE CONTACTING THE SERVICE REPRESENTA- TIVE, CHECK THE FOLLOWING AGAIN

WHEN YOU THINK THAT TROUBLE HAS OCCURRED

Question	Answer (not a malfunction)
The air conditioner cannot be operated	• This protects the air conditioner according to the instructions from the

	The air conditioner		Cannot be cooled
	cannot be operated.		sufficiently.
	d		d
	Check the following.		Check the following.
1	Is the breaker turned	1	Is the temperature set-
	on?		ting correct?
2	Isn’t the fuse blown?	2	Isn’t the filter dirty?
3	Isn’t the ON-timer set?	3	Isn’t the outlet of the out-
			door unit blocked?

Display of the remote

controller does not

appear(1, 2).

The remote control

signal cannot be

received if the remote

controller is not

operated near the air

conditioner (1).

d

Check the following.

1Aren’t the batteries ex- hausted?

2Is the polarity (+, -) of the batteries correct?

When a power failure

occurs.

To restart the unit, press the ON/OFF button on the remote controller again af- ter the restoration of the power.

for about 3 minutes when restarted.	microprocessor.
	Please wait.
Cracking sound is heard.	• This sound is generated by the expansion/contraction of the front panel, etc.
	due to change in temperature.
The room smells strange.	• The air conditioner sucks in an odor adhering to the wall, carpet, furniture,
	cloth, etc. and blows it out with air.
The fan stops during the DRY operation.	• In DRY operation, the unit operates using the same refrigerant circuit as in
	COOL operation. DRY operation time has to be reduced in order to lower
	humidity without much room temperature decreasing. So the compressor
	sometimes stops, and at the same time the indoor fan stops. This prevents
	water condensed on the heat exchanger from evaporating again.
The sound of water flowing is heard.	• This is the sound of refrigerant flowing inside the air conditioner.
	• This is the sound of condensed water flowing in the heat exchanger.
	• This is the sound of the heat exchanger defrosting.
The sound as burbling is heard.	• This sound is heard when the outside air is absorbed from the drain hose in
	turning on the range hood or the ventilation fan and that makes water flowing
	in the drain hose spout out. This sound is also heard when the outside air

Even if the above items are checked, when the air conditioner does not recover from the trouble, stop using the air conditioner and consult your dealer.

In the following cases, stop operation and consult your dealer.

•The remote control signal may not be received in a room where an electronic ON/OFF type fluorescent lamp (inverter type fluorescent lamp, etc.) is used.

•In the region where the electric wave is weak, when the air conditioner is operated, noise may be generated in radio reception.

•When thunder is heard, stop operation and turn off the breaker. Otherwise, the electrical parts may be damaged.

	blows into the drain hose in case the outside wind is strong.
The room cannot be cooled sufficiently.	• When a ventilation fan or a gas cooker is used in a room, the cooling load
	increases, resulting in an insufficient cooling effect.
	• When the outside air temperature is high, the cooling effect may not be suf-
	ficient.
Mechanical sound is heard from the in-	• This is the switching sound in turning on/off the fan or the compressor.
door unit.
The air flow direction is changed during	• When the air conditioner is operated in the COOL or DRY mode, if the opera-
operation.	tion continues with air blowing down for 1 hour, the direction of the air flow is
	automatically set to position 1 to prevent condensed water from dropping.
Water leaks from the outdoor unit.	• During COOL and DRY operations, pipe or pipe connecting sections are
	cooled and this causes water to condense.

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