Hi, thanks for your reply, the serial no is S/N 7090100111. I checked the temperature in the freezer I have it set to -24c and the reading is -18 c – 24 c. I have removed the cover from the inside of the fridge at the top where the fan is, when you close the door and open the fridge door again the light comes on and you can see the fan spinning. The fan stops when the door is open, and if you open and close it the fan goes off and on. Is there a fan in the freezer that pushes the cold up to the fridge?. Thanks