Frank L Concord , NC May 03, 2016 Appliance: Samsung Refrigerator RF263AEBP/XAA Samsung Refrigerator Rf263aebp/Xaa / : The refrigerator wasn't cooling and ice was forming on the inside back wall. How to replace Refrigerator Defrost Heater. Replaced defrost heater Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes