DC Inverter U-match Series Duct Type Unit
60
(2) The following situations are not operation failures.
Problem
Time of occurrence
Cause
Mist comes from
the air conditioner.
During operation.
If the unit is running under
high humidity, the wet air in
the room will be quickly
cooled down.
The air conditioner
generates some
noise.
System switches to heating
mode after defrosting.
Defrosting process will
generate some water, which
will turn to water vapor.
The air conditioner is
buzzing at the beginning of
operation.
Some components will be
buzzing when it starts
working. The noise will
become weak 1min later.
When the unit is turned on,
it purrs.
When the system is just
started, the refrigerant is not
stable. About 30s later, the
purr of the unit becomes low.
About 20s after the unit first
enables the heating mode
or there is refrigerant
brushing sound when
defrosting under heating.
It’s the sound of 4-way valve
switching direction. The sound
will disappear after the valve
changes its direction.
There is hissing sound
when the unit is started or
stopped and a slight
hissing sound during and
after operation.
It’s the sound of gaseous
refrigerant that stops flowing
and the sound of drainage
system.
There is a sound of
crunching during and after
operation.
Because of temperature
change, front panel and other
components may be swelled
up and cause abrasion sound.
There is a hissing sound
when the unit is turned on
or suddenly stopped during
operation or after
defrosting.
Because refrigerant suddenly
stops flowing or changes the
flow direction.
Dust comes from
the air conditioner.
The unit starts operation
after being unused for a
long time.
Dust inside the indoor unit
comes out together with the
air.
The air conditioner
generates some
smell.
During operation.
The room smell or the smell of
cigarette comes out through
the indoor unit.
