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P5415078-rev.3
18. Troubleshooting
18.1 This is Not Abnormal
Phenomenon Cause and Action
Stopped Operation
All indication lamps on the
remote control switch are
turned OFF.
The micro-computer is activated to protect the
device from electromagnetic waves.
The operation can be recovered if it is started from
the beginning.
After power failure
Start the operation from the beginning.
If the instantaneous power failure is within 2
seconds, the operation is restarted automatically.
White Steam
from Indoor Unit
During the heating operation
It may occur during the defrosting operation in the
heating operation.
White Smoke
from Indoor Unit
At the beginning of the heating
operation season.
The dust attached to the heat exchanger has been
dried.
Mist from Indoor Unit
The indoor unit is used in a
restaurant or a kitchen.
Oil is attached to the ns and the heat exchange
efciency may be decreased.
During the dry operation
It may occur when the air outlet temperature
becomes lower.
Raise the set temperature and the air ow volume.
During the cooling operation
in humid environment.
Odor from Indoor Unit
The air ow from the indoor
unit has odor.
It may occur because the cigarette smoke and room
odor are stuck inside the indoor unit.
Ventilate well by the fan mode and clean the air
lter, the at panel, the air outlet and the air inlet
grille. It may be effective for odor eliminating.
Sound from Indoor Unit
Sound is heard when starting
or stopping the operation.
It is generated because the resin parts are stretched
by the temperature change and rubbed with other
parts.
Sound of water owing or
burbling is heard during the
operation.
It is generated because the refrigerant ows or the
drain-up mechanism drains water. Especially, the
sound may be heard when starting the operation or
stopping the compressor (for approx. 3 minutes).
Growling sound may be heard
temporarily right after the air
ow volume is changed.
It is generated because the fan motor makes
temporary sound by change of fan speed.
Dew on Panel
Dew condensation occurs on
the panel or the cabinet or
dew drops.
It may occur if the operation is performed in humid
place (relative humidity is approx. 80%.) for a long
time.
Turned ON “HOT-ST” on LCD
The indications may be turned ON or ash
according to the operation mode or condition.
Flashing Operation Mode on LCD
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