Before Contacting The Service Representative, Check The Following Again; When You Think That Trouble Has Occurred - Mitsubishi Electric MCFH-13NV Operation Manual

BEFORE CONTACTING THE SERVICE REPRESENTA-
TIVE, CHECK THE FOLLOWING AGAIN
The air conditioner Cannot be cooled
cannot be operated. or heated sufficiently.
d d d d d d d d d d
Check the following. Check the following.
1 Is the breaker turned 1 Is the temperature set-
on? ting correct?
2 2
Isn't the fuse blown? Isn't the air filter dirty?
3 Isn't the ON-timer set? 3 Isn't the outlet of the out-
door unit blocked?
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.
Display of the remote
When a power failure
controller does not
occurs.
appear(1, 2).
d d d d d
The remote control
Check the following after
signal cannot be
the restoration of the
received if the remote
power.
controller is not
If the air conditioner had
operated near the air
conditioner (1). operated before the power
d d d d d
failure, as these models
Check the following. are equipped with the auto
restart function, the air
1 Aren't the batteries ex-
conditioner should start
hausted?
operating again. (Refer to
2
Is the polarity (+, -) of
Description of "AUTO RE-
the batteries correct?
START FUNCTION" on
page 6.)
1
Does the air condi-
tioner start operating
again?

WHEN YOU THINK THAT TROUBLE HAS OCCURRED

Question
The air conditioner cannot be operated • This protects the air conditioner according to the instructions from the
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
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.
• In the heating operation, if the air flow temperature is too low or when de-
frosting is being done, the horizontal vane position is automatically set to
position 1.
Water leaks from the outdoor unit. • During COOL and DRY operations, pipe or pipe connecting sections are
cooled and this causes water to condense.
• In the heating operation, the defrosting operation makes water frozen on the
outdoor unit melt and drip down.
• In the heating operation, water condensed on the heat exchanger drips down.
Air does not blow out soon in the heat- • Please wait as the air conditioner is preparing to blow out warm air.
ing operation.
The operation is stopped for about 10 • Defrosting of the outdoor unit is being done (Defrosting operation).
minutes in the heating operation. Since this is completed in 10 minutes, please wait.(When the external tem-
perature is too low and humidity is too high, frost is formed.)
Hissing sound is sometimes heard. • This is the sound when the flow of refrigerant inside the air conditioner is
switched.
The air conditioner starts the operation • These models are equipped with an auto restart function. When the main
only with the main power turned on, power is turned off without stopping the air conditioner with the remote con-
though you do not operate the unit with troller and is turned on again, the air conditioner will start operation auto-
the remote controller. matically in the same mode as the one set with the remote controller just
before the shutoff of the main power.
Answer (not a malfunction)
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