Gree FLEXX36HP230V1AO Installation & Owner's Manual page 31

DC Inverter Series for R410A Unitary Split Air Conditioner
The following situations are not operation failures.
Problem
Mist comes from the air
conditioner.
The air conditioner
generates some noise.
Dust comes from the
air conditioner.
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.
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Cause
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.
Thermostat 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 units come
out together with the air.