Hitachi RAS-X24CCK Instruction Manual page 19

AFTER SALE SERVICE AND WARRANTY
WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.
CONDITION
When it does not operate
When it does not cool well
Notes
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Please contact your sales agent immediately if the air conditioner still fails to operate normally after the above
inspections. Inform your agent of the model of your unit, production number, date of installation. Please also
inform him regarding the fault.
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Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the
specified capacity.
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Is the fuse all right?
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Is the voltage extremely high or low?
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Is the circuit breaker " ON " ?
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Is the air filter blocked with dust?
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Does sunlight fall directly on the outdoor unit?
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Is the air flow of the outdoor unit obstructed?
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Are the doors or windows opened, or is there any source of heat
in the room?
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Is the set temperature suitable?
In quiet or stop operation, the following phenomena may occassionally occur,
but they are not abnormal for the operation.
(1) Slight fl owing noise of refrigerant in the refrigerating cycle.
(2) Slight rubbing noise from the fan casing which is cooled and then
gradually warmed as operation stops.
The odor will possibly be emitted from the room air conditioner because the
various odor, emitted by smoke, foodstuffs, cosmetics and so on, sticks to it.
So please clean the air filter and the evaporator regularly to reduce the odor.
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CHECK THE FOLLOWING POINTS