Hitachi RAC-70YH7, Service Manual

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AFTER SALE SERVICE AND WARRANTY
WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.
When it does not operate
● Is the fuse all right?
● Is the voltage extremely high or low?
● Is the circuit breaker “ON”?
● Is the setting of operation mode different from other indoor
units?
● Is the air filter blocked with dust?
● Does sunlight fall directly on the outdoor unit?
● Is the air flow of the outdoor unit obstructed?
● Are the doors or windows opened, or is there any source of
heat in the room?
● Is the set temperature suitable?
● Are the air inlets or air outlets of indoor and outdoor units
blocked?
● Is the fan speed “LOW” or “SILENT”?
CONDITION CHECK THE FOLLOWING POINTS
Notes
● In quiet operation or stopping the operation, the following phenomena
may occassionally occur, but they are not abnormal for the operation.
(1)
Slight flowing 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 the air filter and the evaporator regularly must be cleaned
to reduce the odor.
●
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.
●
Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the
specified capacity.
When it does not cool well
When it does not hot well
If the remote controller is
not transmitting a signal.
●
Do the batteries need replacement?
● Is the polarity of the inserted batteries correct?
Remote controller
display is dim or blank.)
NOTE:
● If the supply cord is damaged, it must be replaced by the special cord obtainable at authorized
service parts centers.
●
On switching on the equipment, particularly when the room light is dimmed, a slight brightness fluctuation
may occur. This is of no consequence.
The conditions of the local Power Supply Companies are to be observed.