Michele J Jackson , MS November 10, 2020 Appliance: Frigidaire Refrigerator LFTR1814LWC Frigidaire Refrigerator Lftr1814lwc / : The freezer was iced up. How to replace Defrost Thermostat. I replaced the defrost thermostat, defrost heater, and defrost timer all three parts were replaced. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes