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REFERENCE INFORMATION
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10-3) Q&A
Descriptions of symptoms
Check Points
Corrective Measures
▶ Noise (resonance) problems keep on
even though the noise generating
BLDC motors for both of the
compartments are replaced several
times. What does generate the
resonance and how can it be settled
down?
When the BLDC fan motor rotates in low
RPM, The friction with air is quite high
and it generates "grinding" noises.
If you replace the ambient thermistor
with a 2.7K resistance (detecting
109.4℉), the BLDC fan motor rotates
in high RPM, which reduces friction
with air resulting in reduction of the
"grinding" resonance.
▶ What causes the "knocking" noises?
How to solve it?
It makes "knocking" or "branch
breaking" noises when the liner and
the shelves hit each other due to the
fluctuation of the inside air pressure
upon door open/close. Also, these noises
occur when the liners and the
shelves hit each other as the liners
expand and contract due to the
temperature change in both of the
compartments.
Check the clearance between the
selves and the liners.
①
Freezer Shelves : Remove the trim
shelves already attached and replace
them with those supplied for service.
②
Fridge Shelves : Because noise-
preventing trim selves are not
attached, it needs attaching.
▶ What is the solution if the same
problem occurs even though the
counter action in the service bulletin
has been implemented already for
the "knocking" noises?
Check if the selves wobble. If they do, have shelves sit firmly on their places.
▶ What causes the liquid passing noises
from the back of the refrigerator?
Refrigerant goes into the evaporator via the capillary tube in which the refrigerant
expands as it circulates the cooling cycle. At this time, the refrigerant is in its
liquid state and it starts evaporating as it reaches at the inlet of the evaporator
with a bigger diameter, which causes the refrigerant noises. And, it gets worse
when the refrigerant does not flow freely.
▶ What is the solution for the
compressor noises?
For new refrigerators
Check if the refrigerator is leveled.
Check if the refrigerator wobbles by
shaking with hands.
Check if there is enough clearance
at the back of the refrigerator for
the ventilation of the machine
compartment.
If there is not enough clearance or it is
blocked by things such as newspaper,
there could be resonance noises.
Required clearance around the product.
More than 2 inches from the back, 12
inches from the top and 4 inches from
its sides.
▶ What is the solution for the
compressor noises?
For old refrigerators
Dust could get built-up in the machine
compartment. Then, its ventilation
would get restricted which makes the
refrigerator overheated resulting in the
increase of the noise level.
Explain it to customers and let
them clean dust or any other
foreign substances in the machine
compartment.
As the vibration proof rubbers get
hardened, noises generate during the
comp operation.
(The noise level is quite high.)
→ Replace the vibration proof rubbers.
The compressor is dislocated due to
impact during its transportation such as
moving-in.
→ Check if it's dislocated when it is more
noisy after moving-in.
▶ During the comp start-up, iron
friction noises occur. What causes
them?
The reciprocation piston could get worn out or inner components could get
dislocated.
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