
En-11
● OPERATING INSTRUCTIONS ●
Even if these items are checked, when the unit does not recover from the trouble,
stop using the air conditioner and consult your dealer.
Symptom Explanation & Check points
Indoor Unit
The unit cannot be operated. • Is the breaker turned on?
• Is the ON timer set? Page7
The unit cannot be operated for
about 3 minutes when restarted.
• This protects the unit according to instructions
from the microprocessor. Please wait.
Mist is discharged from the air
outlet of the indoor unit.
• The cool air from the unit rapidly cools moisture
in the air inside the room, and it turns into mist.
The swing operation of the
HORIZONTAL VANE is
suspended for a while, then
restarted.
• This is for the swing operation of the HORIZON-
TAL VANE to be performed normally.
The air fl ow direction changes
during operation.
The direction of the horizontal
vane cannot be adjusted with
the remote controller.
• In the heating operation, if the air fl ow tem-
perature is too low or when defrosting is being
done, the horizontal vane is automatically set to
horizontal position.
The operation is stopped for
about 10 minutes in the heating
operation.
• Defrosting of the outdoor unit is being done.
Since this is completed in max.10 minutes, please
wait. (When the outside temperature is too low
and humidity is too high, frost is formed.)
The unit starts operation by itself
when the main power is turned
on, though it isn’t operated with
the remote controller.
• These models are equipped with an auto
restart function. When the main power is
turned off without stopping the unit with the
remote controller and is turned on again, the
unit starts operation automatically in the same
mode as the one set with the remote control-
ler just before the shutoff of the main power.
Refer to “Auto restart function”. Page 5
The indoor unit which is not
operating becomes warm and a
sound, similar to water fl owing,
is heard from the unit.
• A small amount of refrigerant continues to fl ow
into the indoor unit even though it is not operating.
The indoor unit discolors over
time.
• Although plastic turns yellow due to the infl uence
of some factors such as ultraviolet light and
temperature, this has no effect on the product
functions.
Outdoor Unit (Multi system)
When heating operation is se-
lected, operation does not start
right away.
• When operation is started during defrosting of
outdoor unit is done, it takes a few minutes (max.
10 minutes) to blow out warm air.
The fan of the outdoor unit
does not rotate even though the
compressor is running. Even if
the fan starts to rotate, it stops
soon.
• When the outside temperature is low during cool-
ing operation, the fan operates intermittently to
maintain suffi cient cooling capacity.
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, water condensed on the
heat exchanger drips down.
• In the heating operation, the defrosting operation
makes water frozen on the outdoor unit melt and
drip down.
White smoke is discharged from
the outdoor unit.
• In the heating operation, vapor generated by the
defrosting operation looks like white smoke.
Remote controller
The display on the remote
controller does not appear or it
is dim. The indoor unit does not
respond to the remote control
signal.
• Are the batteries exhausted? Page 3
• Is the polarity (+, -) of the batteries correct?
Page 3
• Are any buttons on the remote controller of other
electric appliances being pressed?
Does not cool or heat
The room cannot be cooled or
heated suffi ciently.
• Is the temperature setting appropriate?
Page 5
• Is the fan setting appropriate? Please change fan
speed to Med. or High.
• Is the fi lter clean? Page 9, 10
• Is the fan or heat exchanger of the indoor unit
clean? Page 9, 10
• Are there any obstacles blocking the air inlet or
outlet of the indoor or outdoor unit?
• Is a window or door open?
• It may take a certain time to reach the setting
temperature or may not reach that depending on
the size of the room, the ambient temperature,
and the like.
Symptom Explanation & Check points
Does not cool or heat
The room cannot be cooled
suffi ciently.
• When a ventilation fan or a gas cooker is used in
a room, the cooling load increases, resulting in an
insuffi cient cooling effect.
• When the outside temperature is high, the cooling
effect may not be suffi cient.
The room cannot be heated
suffi ciently.
• When the outside temperature is low, the heating
effect may not be suffi cient.
Air does not blow out soon in
the heating operation.
• Please wait as the unit is preparing to blow out
warm air.
Airfl ow
The air from the indoor unit
smells strange.
• Is the fi lter clean? Page 9, 10
• Is the fan or heat exchanger of the indoor unit
clean? Page 9, 10
• The unit may suck in an odor adhering to the wall,
carpet, furniture, cloth, etc. and blow it out with the
air.
Sound
Cracking sound is heard. • This sound is generated by the expansion/con-
traction of the intake grille, etc. due to change in
temperature.
The sound as burbling is heard. • This sound is heard when the outside air is ab-
sorbed from the drain hose by turning on the range
hood or the ventilation fan, making water fl owing
in the drain hose to spout out.
This sound is also heard when the outside air
blows into the drain hose in case the outside wind
is strong.
Burbling sound is heard from
the indoor unit when DRY/
COOL operation is stopped.
• This is the sound of drained water fl owing back-
ward in the drain piping in the ceiling.
Mechanical sound is heard
from the indoor unit.
• This is the switching sound in turning on/off the
fan or the compressor.
The sound of water fl owing is
heard.
• This is the sound of refrigerant or condensed water
fl owing in the unit.
Hissing sound is sometimes
heard.
• This is the sound when the fl ow of refrigerant
inside the unit is switched.
The sound of motor and swirl-
ing sound is heard from the
indoor unit.
• This is the sound of water condensed during
COOL/DRY operation being drained from the
indoor unit.
• Sound of water draining may also be heard from
indoor units which are not operating. (The sound
will stop automatically. Please wait.)
Timer
Weekly timer does not operate
according to settings. • Is the ON/OFF timer set? Page 7
• Transmit the setting information of the weekly timer
to the indoor unit again. When the information is
successfully received, a long beep will sound from
the indoor unit. If information fails to be received,
3 short beeps will be heard. Ensure information
is successfully received. Page 8
• When a power failure occurs and the main power
turns off, the indoor unit built-in clock will be incor-
rect. As a result, the weekly timer may not work
normally.
Be sure to place the remote controller where
the signal can be received by the indoor unit.
Page 4
The unit starts/stops the opera-
tion by itself.
• Is the weekly timer set? Page 8
Dirt
The ceiling and wall around the
indoor unit get dirty.
• Please clean the periphery of the air conditioner
frequently.
• It may prevent the dirt to lower the wind blowing to
the ceiling by adjusting the vertical wind direction.
In the following cases, stop using the air conditioner and consult your dealer.
• When water leaks or drips from the indoor unit.
• When the upper operation indicator lamp blinks.
• When the breaker trips frequently.
• The remote control signal is not received in a room where an electronic ON/OFF type
fl uorescent lamp (inverter-type fl uorescent lamp, etc.) is used.
• Operation of the air conditioner interferes with radio or TV reception. An amplifi er may
be required for the affected device.
• When an abnormal sound is heard.
• When any refrigerant leakage is found.
WHENYOU THINK THATTROUBLE HAS OCCURRED
BH79A640H01_01En.indd 11 2021/02/25 10:12:55