Eugene G Easton , PA February 05, 2022 Appliance: General Electric Refrigerator TFX24ZRXAAA Ge Refrigerator Tfx24zrxaaa: Refrigerator stopped working. How to replace Defrost Timer. Had earlier replaced the defrost heaters. Installed the defrost timer to update the refrigerator, purchased in 1993. Do-It-Yourself Rating: Repair Time Estimate: 2+ hours