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  Chris at eSpares says...

  It sounds like a defrost problem, There is a heater on the evaporator that should melt and clear the ice every sixteen hours or so. Carefully remove the cover (if it is not frozen on) and check the heater and this fuse and any thermal cut outs if fitted (cannot be specific as no model number given). If it is an RSH american fridge-freezer there is a modification to prevent an ice ball occurring.