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.
To do list
4. Check the installation status
4-4. Q&A
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