Roper refridgerator model # RT18AKXKQ05 Back of freezer freezes up water (defrosted???) and clogs all the vents in back. Then a sheet of ice forms. Meanwhile, a dripping is going on in the refridgerator all over our stuff. Under the vegetable crisper trays is also a sheet of ice. We have it set under the halfway mark for temperature. kkeene1951@hotmail.com