For a few weeks there was now but constantly temperature alarm. The unit ran continuously, but barely made it under -12 degrees. Since the still happened fortunately in the warranty period, the customer service was - - and had to defrost the part for over an hour with the hair drier.
What happened? Well - the trick of "NoFrost" technology is obvious that the ice is not visible arises, but invisible behind a veneer (where the air sucked executed and is passed through cooling fins). Then, the cooling of course does not work properly. And since no ice was visible (and yes you never have to defrost again), you could not even think that.
Was the recommendation of customer service: "regularly defrost".
So you can actually 200, - save euro premium over non-frost-free devices - and it looks naturally beautiful without visible ice in the closet.