Toyotomi KURO Mini Service Manual page 156

TOYOTOMI
（2）The following situations are not operation failures.
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 Toyotomi'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
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U-Match 5 SERIES UNIT SERVICE MANUAL
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.
Temperature control 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.