Toshiba RAS-M10GDCV-E Owner's Manual page 23

Before you ask for servicing or repairs, check the following points.
Inoperative
• The power main switch is turned off.
• The circuit breaker is activated to cut off power supply.
• The main power fuse has blown out.
• Stoppage of electric current.
• The batteries in the remote controller are exhausted.
• ON timer is set.
• Selected indication (B) on the switch panel unit differs
from that of the remote controller selector (B).
Does not cool well or heat well
• The air inlet and/or outlet of the outdoor unit is blocked.
• Doors or windows are opened.
• The fan speed is set to low.
• The air conditioner is set in the ECONO. or DRY mode.
• The set temperature is too high. (In cooling operation)
• The set temperature is too low. (In heating operation)
Indoor unit or outdoor unit makes a strange noise.
• When temperature sharply changes, the indoor or outdoor unit
occasionally makes a strange noise because of expansion/contraction
of parts or change of refrigerant flow.
The room air is smelly or a bad odor comes from the air conditioner.
• Smells impregnated in the walls‚ carpets, furniture, clothing, or furs,
come 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 turned on.
Reset the circuit breaker to ON.
(To stop flashing, see "Power Failure" on page 18.)
Sound issues from indoor unit when it is not operating.
• When other indoor units are operating, some sound may be audible
even from indoor units that are turned off.
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.
• Air flow from the indoor unit is occasionally changed in the cooling operation.
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.
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Calm