Karen H Pittsburgh , PA February 14, 2016 Appliance: Frigidaire Refrigerator FRT18S6JQ4 Frigidaire Refrigerator Frt18s6jq4: Defrost timer. How to replace Refrigerator Defrost Timer. On my own using your "How To" video. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes