Ronald S Snohomish , WA November 16, 2014 Appliance: Samsung Refrigerator RS257BARB/XAA Samsung Refrigerator Rs257barb/Xaa / : Refrigerator defroster burned out and ref warmed up due to ice build up. How to replace Evaporator Assembly. Removed defrost heater from freezing coil assembly and replaced heater in refrigerator after melting ice off coil. Not too difficult but refrig gave different error codes at different times until part was installed. Learned that refrig fan only runs with door switches closed. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours