HTW MULTISPLIT IX21D3 Manuel De L'utilisateur page 28

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