Gree U-Match 5 Series Manual page 93

GREE
(2) The following situations are not operation failures.
Phenomenon
Mist comes from the air
conditioner.
The air conditioner
generates some noise.
Dust comes from the air
conditioner.
The air conditioner
generates some smell.
NOTICE:
Check the above items and adopt the corresponding corrective measures. If the air conditioner continues to
function poorly, please stop the air conditioner immediately and contact Gree's authorized local service center.
Ask our professional service staff to check and repair the unit.
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.
U-Match 5 SERIES UNIT SERVICE MANUAL
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.
Temperature controller 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.
90
Cause