Miele refrigerator Model KFN 8993 SDE (I believe)

Sorry for my English ;) I have refrigerator miele cause seemed to be a good stuff. So one day we decide to buy a used one for to have a bit of luxury ;))) Worked fine for 2 years, and suddenly we have got alarm! Middle of a night! First solution: turn off and after a few minutes turn on. Can help for a few hours, sometimes for more then one day. I read that time a lot how to solve the problem, but in the end seems like to contact with service is the only one. Because I'm a curious guy and I see that the problem is with temp. sensor in freezer, started to look for it. Eureka!!!!!! I found the problem! So.... What'd I did? Turned of the stuff. (disconected from power supplier). Then empty freezer, all boxes and aluminum shelves. In the back is white cover (plastic one) with 3 or 4 screws (need Tory bit for screwdriver to take them off). Behind I found something like a aluminum radiator, completely covered with ice. Under this was a place for water to be taken away also frosted. I took a heater to get rid of the ice. When was clear, the cover back, and voila!!!! Now is two months with no problem. Even sounds different than before. If any questions you can send to : wojta (at) plusnet.pl Good luck!

Similar to this, although I also had a build up of frost in the freezer. Advice from Miele:

"You have a fault on freezer evaporator sensor and will need an engineer to call and repair please contact our office o 01235554466 to arrange a service visit."

Rather than this, which i assumed would be expensive but didn't bother calling, I defrosted the fridge/freezer overnight and turned it back on in morning. Freezer cooled down to -18 in a few hrs and since then all is working fine - it's been a couple of weeks or so now.