Ronald M Wharton , TX June 24, 2016 Appliance: Samsung Refrigerator RB1955SH/XAA Samsung Refrigerator Rb1955sh/Xaa: Coils in freezer freezing up. How to replace Refrigerator Defrost Thermal Fuse Assembly. Replaced thermal fuse after checking to see if it was defective. After installing it the freezer got too cold, I unpluged it an plugged it back in , Been working like it should for two day's now. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes