Symptom-based Troubleshooting
Si20-701_B
51
YES
YES
NO
Normal.
The noise is a
sound generated
at the time of
refrigerant flow
change or stop.
Continuous
slight noise of
"shoo..." during cooling
or defrosting
Normal.
The sound is
flushing noise of
refrigerant inside
air conditioning
unit.
Sound
of "shoo..."
generates just
after operation start or
stop, or defrosting
start or stop.
NO
YES
NO
Normal.
Operation sound
of draining
device
YES
NO
Normal.
Creak generates
by shrinkage of
resin parts due to
temperature
change.
YES
NO
It is normal.
After vacuum
drying, charge
correct amount of
refrigerant.
An impact noise can
be reduced by means
of "Defrost Noise
Reduction Setting."
• Refrigerant overcharge
• Air mixed in refrigerant
system
• Flushing noise due to
refrigerant shortage.
(Sound of shoo...)
Sound
of "shoo..."
generates during
cooling or after
operation
stop.
Creak
during heating
and after operation
stop
Is this
an impact
noise at the start/end
of defrosting?
A