Samsung RF18A Series Service Manual page 109

REFERENCE INFORMATION
Descriptions of symptoms
▶ What can be checked when the unit
sends out noises?
▶ Why is the fridge compartment not
cool? (Not a defect)
▶ Why is the food melt eventhough the
display of the freezer compartment
shows -4℉?
▶ What is the reason that vegetables
get frozen even though the fridge
compartmentis 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?
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1. Check its symptoms and patterns.
2. Check if the unit is installed on a firm and leveled floor.
3. Check if the unit is installed close to the customer's living area.
4. Check if the panel on the machine compartment hits on the rear wall and the
unit has enough clearance with the rear wall.
5. Check if the refrigerant pipes are shaped as normal.
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.
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.
Check Points
109
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.)