Gree GUD50PS/A-T - Page 79

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
74
（2）The following situations are not operation failures.
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.
Temperature control will be buzzing
when it starts working. The noise will
become weak 1min later.
Dust comes from the air
conditioner.
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.
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.
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.