Samsung RS757LHQESR/ Series Service Manual page 76

REFORENCE INFORMATION
Descriptions of symptoms
▶Why is the fridge
compartment not cool?
(Not a defect)
▶Why is the food melt
even though the
display of the freezer
compartment shows
-4℉?
▶What is the reason that
vegetables get frozen
even though the fridge
compartment is set to
MIN?
▶What can be done when
frozen food gets melt in
the freezer compartment
or it does not cool down?
▶Why doesn't the
compressor operate
upon power supply?
▶Why does it send out
"Ding Dong" or alarm
sounds with the doors
closed?
Check Points
Advise customers to adjust its temperature level to one or two
step higher. For example, when the ambient temperature is low
such as in winter (especially, when you use it in the morning
with the door not being opened or closed during the night), the
compartment temperature could get increased by 33.8~35.6℉.
So, advise customers to shift its temperature level and explain
to them that it does not affect its power consumption that much
when its temperature setting is adjusted to one or two step
lower.
Check the compartment
temperature with a
thermometer.
Replace the fridge thermistor because it could be faulty.
1st: Check if the thermistor works after referring to the self-
diagnosis checklist on the MAIN-PCB cover. If the over-
cooling keeps on even though there is no problem with the
above, replace it.
Defrost it by using hot water and check the defrost system for
any fault. And then, eliminate the root causes so as to prevent
it from reoccurring.
Upon the initial power on, the compressor starts operating after
a five minute delay to protect the compressor. So, please wait
until it starts operating.
Check if the food sticks out preventing the doors from closing
properly. If it send out the above sounds with the door closed
well, the door switch may not have been pressed down
completely. So, make sure for the door switches to be pressed
completely. Still, if it does not stop going off, check the wiring
connections because the door switch signals may not be
inputted into the PCB. And, when the door switch is faulty or it
is not pressed down completely, the fan does not rotate and it
causes low-cooling advancing to a defrost problem.
Note : When it comes to automatic models, the fan motor does
not operate right on with the door closed after being opened.
The fan motor for dual-evaporator refrigerators starts after a
50℉~second delay and when the ambient temperature is
higher than 91.4℉, it starts after a minute.
75
Corrective Measures
If it is considered to be low
cooling,
When the BLDC motor fan
does not rotate because its
restriction is not picked up.
When the evaporator is
frozen-up (defrost it)
Temp detection error
according to the characteristic
change of the thermistor (set
the compartment temperature
or replace the thermoistor)