Thomas G Overton , NV November 18, 2017 Appliance: Frigidaire Refrigerator FRT18IL6JW1 Frigidaire Refrigerator Frt18il6jw1: Refridgerator temp got warm although freezer remained ice cold. How to replace Defrost Timer. With the help of a friend who had knowledge of appliance repairs, we replaced the defrost timer and defrost heater. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours