William K Salem , NH November 29, 2020 Appliance: Samsung Refrigerator RF28HDEDBSR/AA Samsung Refrigerator Rf28hdedbsr/Aa / 0000: Refrigerator section stopped cooling, ultimately finding it was all iced up. Concluding a defrost system not functioning. How to replace Refrigerator Condenser Cleaning Brush. Replaced defrost heater and defrost temp sensor. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes