INVENTOR U5MRSL32-18 Benutzerhandbuch Seite 12

Problem
A squeaking sound is heard when the system is OFF or in COOL mode. The
noise is also heard when the drain pump (optional) is in operation.
The indoor
unit makes
noises
A squeaking sound may occur after running the unit in HEAT mode due to ex-
pansion and contraction of the unit's plastic parts.
A low hissing sound may occur during operation. This is normal and is caused
by refrigerant gas flowing through both the indoor and outdoor units.
Both the in-
door unit and
outdoor unit
A low hissing sound may be heard when the system starts, has just stopped
make noises
running or is defrosting. This noise is normal and is caused by the refrigerant
gas stopping or changing direction.
The outdoor
unit makes
The unit will make different sounds based on its current operating mode.
noises
Dust is emit-
ted from
The unit may accumulate dust during extended periods of non-use, which will
either the be emitted when the unit is turned on. This can be mitigated by covering the
indoor or out- unit during long periods of inactivity.
door unit
The unit may absorb odors from the environment (such as furniture, cooking,
cigarettes, etc.) which will be emitted during operations.
The unit emits
a bad odor
The unit's filters have become moldy and should be cleaned.
The fan of
the outdoor
During operation, the fan speed is controlled to optimize product operation.
unit does not
operate
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Possible Causes