Toshiba RAS-18UFHP-ES Owner's Manual page 22

Before you ask for servicing or repairs, check the following points.
The back of indoor unit is dewed.
• Dewdrops on the back of the indoor unit are automatically
collected and drained out.
Indoor unit or outdoor unit makes a strange noise.
• When temperature sharply changes, the indoor or
outdoor unit occasionally makes a strange noise (like tit-tack
noise or flowing noise) because of expansion/contraction of
parts or change of refrigerant flow.
The room air is smelly.
A bad odor comes from the air conditioner.
• Smells impregnated in the wall, carpet, furniture, clothing, or
furs, are coming out.
The OPERATION lamp goes on and off.
• The lamp goes on and off 1 Hz when power is restored after a
power failure, or when the power main switch is set to on.
Reset the circuit breaker to ON.
Outdoor unit is frosted in heating operation.
Water is drained out of outdoor unit.
• The outdoor unit is sometimes frosted in heating operation.
In that case, the unit automatically performs defrosting (for 2 to
10 minutes) for raising the heating efficiency.
• In defrosting operation, both the indoor and outdoor units stop
air flow.
• Hiss sound is heard when flow of the refrigerant is changed for
defrosting.
• Resultant water of automatic defrosting in heating operation is
drained out of the outdoor unit.
Air flow changes though the FAN button is not set to
the AUTO mode.
• When the temperature of blown air goes down in heating
operation, the air conditioner automatically changes or stops
air flow from the indoor unit not to make persons in the room
feel chilly.
A white mist of chilled air or water is generated from
the outdoor unit.
• The indoor unit in cooling operation or the outdoor unit in
defrosting operation occasionally steams.
Automatic operation of vertical air flow louver.
• When the room temperature or outdoor temperature is high in
the heating operation, the vertical air flow louver once close and
then set themselves automatically to the original set position
again.
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