I am going to share my story of how I fixed my Bosch KGN53X00AU. It had worked well for about 5 years until one day a layer of ice started forming at the bottom of the freezer compartment. After breaking and cleaning the ice for several weeks I started looking for information of forums. Defrosting did not help. Customer support line was totally useless. Finally I decided to fix it myself. Nothing was wrong inside, so I decided to check the drain pipe at the back of the fridge. Before going into the details I would like to remind you where the water comes from. If we look at how a fridge works (http://faculty.wcas.northwestern.edu/~in...) we can see two heat exchangers internal (blue) and external (red): Water from the air freezes on the internal heat exchanger and can forms a thick layer of ice. Back in the old days people had to defrost their fridge regularly to remove that ice. Modern fridges do it automatically. The internal heat exchanger has a heating inside which is periodically turned on by the...
