Mitsubishi Electronics MCFZ-A12WV operating instructions When YOU Think That Trouble has Occurred

BEFORE CONTACTINGTHE SERVICE REPRE-

WHEN YOU THINK THAT TROUBLE HAS OCCURRED

SENTATIVE, CHECK THE FOLLOWING AGAIN

Question		Check points
The air conditioner cannot	•	Is the breaker turned on?
be operated.	•	Is the fuse blown?
	•	Is the ON timer set? (Page 9)
The room cannot be cooled	•	Is the temperature setting correct? (Page 7)
or heated sufficiently.	•	Is the filter clean? (Page 10)
	•	Are there any obstacles blocking the air inlet or
		outlet of the indoor or outdoor unit?
	•	Is a window or door open?
The air from the indoor unit	•	Is the filter clean? (Page 10)
smells strange.
The display on the remote	•	Are the batteries exhausted? (Page 5)
controller does not appear	• Is the polarity (+, -) of the batteries correct?
or it is dim. The indoor unit		(Page 5)
does not respond to the re-	•	Are any buttons on the remote controller of other
mote control signal.		electric appliances being pressed?
When a power failure oc-	•	Does the air conditioner start operating again?
curs.		If the air conditioner had operated before the
		power failure, as these models are equipped with
		an auto restart function, the air conditioner
		should start operating again. (Refer to Descrip-
		tion of “AUTO RESTART FUNCTION” on page
		6.)

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 using the air conditioner and consult your dealer.

•When water leaks or drops from the indoor unit.

•When the left operation indicator lamp blinks.

•When the breaker trips frequently.

•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.

•Operation of the air conditioner may interfere with radio or TV reception in areas where the reception is weak. An amplifier may be required for the af- fected device.

•When thunder is heard, stop operation and disconnect the power supply plug and/or turn off the breaker. Otherwise, the electrical parts may be damaged.

Question		Answer (not a malfunction)
The air conditioner cannot	•	This protects the air conditioner according to in-
be operated for about 3 min-	structions from the microprocessor. Please wait.
utes when restarted.
Cracking sound is heard.	•	This sound is generated by the expansion/con-
		traction of the front panel, etc. due to change in
		temperature.
The air from the indoor unit	•	The air conditioner may suck in an odor adher-
smells strange.		ing to the wall, carpet, furniture, cloth, etc. and
		blow it out with the air.
The fan of the outdoor unit	•	When the outside temperature is low, the fan
does not rotate even though		may not operate to maintain sufficient cooling
the compressor is running.		capacity.
Even if the fan starts to ro-
tate, it stops soon.
The sound of water flowing	•	This is the sound of refrigerant flowing inside
is heard.		the air conditioner.
	•	This is the sound of condensed water flowing in
		the heat exchanger.
	•	This is the sound of the heat exchanger defrost-
		ing.
The sound as burbling is	•	This sound is heard when the outside air is ab-
heard.		sorbed 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
		blows into the drain hose in case the outside wind
		is strong.
The room cannot be cooled	•	When a ventilation fan or a gas cooker is used
sufficiently.		in a room, the cooling load increases, resulting
		in an insufficient cooling effect.
	•	When the outside temperature is high, the cool-
		ing effect may not be sufficient.
Mist is discharged from the	•	The cool air from the air conditioner rapidly cools
air outlet of the indoor unit.		moisture in the air inside the room, and it turns
		into mist.
Mechanical sound is heard	•	This is the switching sound in turning on/off the
from the indoor unit.		fan or the compressor.

Question		Answer (not a malfunction)
The air flow direction	•	When the air conditioner is operated in COOL
changes during operation.		or DRY mode, if the operation continues with air
The direction of the hori-		blowing down for 1 hour, the direction of the air
zontal vane cannot be ad-		flow is automatically set to position 1 to prevent
justed with the remote con-		condensed water from dropping.
troller.	•	In the heating operation, if the air flow tempera-
		ture is too low or when defrosting is being done,
		the horizontal vane position is automatically set
		to position 1.
Water leaks from the out-	•	During COOL and DRY operations, pipe or pipe
door unit.		connecting sections are cooled and this causes
		water to condense.
	•	In the heating operation, the defrosting opera-
		tion makes water frozen on the outdoor unit melt
		and drip down.
	• In the heating operation, water condensed on
		the heat exchanger drips down.
White smoke is discharged	•	In the heating operation, vapor generated by the
from the outdoor unit.		defrosting operation looks like white smoke.
Air does not blow out soon	•	Please wait as the air conditioner is preparing
in the heating operation.		to blow out warm air.
The operation is stopped	•	Defrosting of the outdoor unit is being done (De-
for about 10 minutes in the		frosting operation).
heating operation.		Since this is completed in 10 minutes, please
		wait. (When the external temperature is too low
		and humidity is too high, frost is formed.)
Hissing sound is some-	•	This is the sound when the flow of refrigerant
times heard.		inside the air conditioner is switched.
The room cannot be heated	•	When the outside temperature is low, the heat-
sufficiently.		ing effect may not be sufficient.
The air conditioner starts	•	These models are equipped with an auto restart
the operation only with the		function. When the main power is turned off with-
main power turned on,		out stopping the air conditioner with the remote
though you do not operate		controller and is turned on again, the air condi-
the unit with the remote		tioner will start operation automatically in the
controller.		same mode as the one set with the remote con-
		troller just before the shutoff of the main power.

11