Ruben C Citrus Heights , CA July 05, 2015 Appliance: General Electric Refrigerator TFH24PRSBWW Ge Refrigerator Tfh24prsbww: Freezer section was icing and the fridge section was not cooling. How to replace Refrigerator Defrost Timer. I unplugged the fridge until all the ice melted and then installed the defrost heater and defrost timer. The videos from the site was helpful and the job was relatively easy. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours