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DC Inverter U-match Series Cassette Type Unit
(2)
The following situations are not operation failures.
Problem
Mist comes from
the air
conditioner.
The air
conditioner
generates some
noise.
The air
conditioner
generates some
noise.
Dust comes
from the air
conditioner.
The air
conditioner
generates some
smell.
Time of occurrence
During operation.
System switches to heating
mode after defrosting.
The air conditioner is buzzing
at the beginning of operation.
When the unit is turned on, it
purrs.
About 20s after the unit first
enables the heating mode or
there is refrigerant brushing
sound when defrosting under
heating.
There is hissing sound when
the unit is started or stopped
and a slight hissing sound
during and after operation.
There is a sound of crunching
during and after operation.
There is a hissing sound when
the unit is turned on or
suddenly stopped during
operation or after defrosting.
The unit starts operation after
being unused for a long time.
During operation.
If the unit is running under
high humidity, the wet air in
the room will be quickly
cooled down.
Defrosting process will
generate some water, which
will turn to water vapor.
Some components will be
buzzing when it starts
working. The noise will
become weak 1min later.
When the system is just
started, the refrigerant is not
stable. About 30s later, the
purr of the unit becomes low.
It's the sound of 4-way valve
switching direction. The
sound will disappear after the
valve changes its direction.
It's the sound of gaseous
refrigerant that stops flowing
and the sound of drainage
system.
Because of temperature
change, front panel and other
components may be swelled
up and cause abrasion sound.
Because refrigerant suddenly
stops flowing or changes the
flow direction.
Dust inside the indoor unit
comes out together with the
air.
The room smell or the smell of
cigarette comes out through
the indoor unit.
52
Cause
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