Hitachi RAC-18WSA, Instruction Manual, Page: 40 / 308

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Except for anti-mold wasabi cassette, no smell-generating material or
substance is used for air conditioner. This is due to the smell or odor, such
as cigarette, cosmetics and food, present in the room that is sucked in
and then blown out by the air conditioner.
Indicates preheating or defrosting operation is underway.
Indicates internal cleaning operation is underway.
Refrigerant flow noise in the pipe or valve sound generated when flow
rate is adjusted.
Noise generated when the unit expands or contracts due to temperature
changes.
Noise generated with the indoor unit fan ’ s rpm changing such as operation
start times.
Noise of the motori z ed valve when the unit is switched on.
Operation noise changes due to power variations according to room
temperature changes.
M ist is generated as the air within the room is suddenly cooled by
conditioned air.
Water generated during defrosting operation evaporates and steam is
emitted.
Auto fresh defrosting is activated (as the heating operation is stopped, the
microcomputer checks frost accumulated in the indoor unit and instructs
the unit to perform automatic defrosting if necessary).
Depending on the number of person in the room and the conditions of
the room, actual room temperature may deviate slightly from the remote
controller ’ s setting.
THE FOLLOWING CASES DOES NOT INDICATE MALFUNCTION
TROUBLESHOOTING (continued)
Odors
In heating operation,
(OPERATION) indicator lit
and dim repeatedly
(OPERATION),
(CLEAN), indicators lit after
the operations of cooling,
dehumidifying and dry cool
Hissing or fizzy sound
Squeaking noise
Rustling sound
Clicking sound
Operation sound changes
Mist emission
Steam emitted from outdoor unit
Outdoor unit continues to
operate even if operation is
stopped and (OPERATION)
indicator blinks
Preset temperature cannot be
reached