The noise you get that stops when you open the door is the fan unit in the fridge, It freezes up, the fan blade catches the ice. (I think you have very similar to me, I have an rs21j something, side by side FF with water cooler). The problem is caused by the defrost heater not working, IF IT IS under 5 yrs old, Contact Samsung, they extended the guarantee period for this fault, They have an updated fan unit plate, and elements, plus other bits. Other wise you will probably need to get a new defrost thermistor, at the least. possibly a new defrost element, unfortunately the defrost element is only supplied with the fridge side evaporator unit, YOU do NOT need to replace the evaporator, besides you cannot by your self, special equipment, and person MUST be F-Gas qualified. But the heater element can be replaced quite easy, (Bit fidly But) Thermistor is located low down on the element in the back of fridge, They are all plug in bits. The rear inside plate needs to be removed 6 screws, If you have a seperate cool box in the fridge, that needs to come out 1st Use a test meter to check resistance, probably open cct. if so replace it, a few £, If that is ok, Well. New evap section with element, about £80. Again meter out 1st, another symptom, depends on your house wiring, trips would drop out, Fuses would not necesarily blow.
Sheepdog, March 2011