Let me bump this thread because I have an identical refrigerator and the same problem. I read what samsu100 wrote and got to the cover in the freezer. All I had to do was unscrew two screws and remove the cover. There was ice and water in the gutter at the bottom, so I removed it, but what puzzles me is that the water did not flow out of the gutter, it just stood still. Does this mean the drain is frozen or clogged? If so, is it possible to access the drain, e.g. from the back of the refrigerator, to fix it? The defrosting method is not really an option because I have a lot of frozen food :D
As for the heater, yes, it is in this fridge, but I don't know if it heats, because when I took it apart it was cold and ice was accumulating, so it may be damaged. Is it possible to buy such parts somewhere on the website, and if so, at what price? Is it worth calling the service center (costs) or is it better to do it yourself?
Thank you and best regards!
Edit: If I get to this heater, will it be enough to measure its resistance to check it?