:confused: :confused: I have a Samsung RS21NSCV American style fridge freezer which is about 2 1/2 years old. It developed a fault whilst still just in warranty (Nov 2005), the fault being that the fridge section kept freezing up to the extent where the fan blades caught on the build up of ice and made a noise. An engineer replaced something behind the plastic panel covering the cooling tubes. A couple of months ago it started doing the same thing again, and I am having to defrost it almost weekly:mad: :mad: by removing the shelves and then the cover in the back compartment of the fridge. Does it use a thermistor for temperature sensing or could it be that the de-frost heater is not working? Any suggestions as to what the problem might be would be greatly appreciated.