I have a Samsung Refrigerator (2005 Model) that has a continual problem with the cooling coils freezing up. When this happens it stops making ice and the freezer compartment does not stay cool enough. I have to defrost it about every six weeks and would guess I have defrosted it twenty times over the last few years. I have been researching this problems for years and have yet to get it fixed myself. I last replaced the main control board 1/18/15 and hoped this was going to be the final fix. Not so. Had to defrost on 3/18/15 and then again on 5/7/15. Don't know what to try next unless the new control board I bought is bad or something blew on it again.:mad: