Jeffrey G West Liberty , KY August 01, 2017 Appliance: Frigidaire Refrigerator LFTR1814LWB Frigidaire Refrigerator Lftr1814lwb / : Refrigerator would not stay cold; freezer worked good. How to replace Defrost Heater. Replaced the defrost heater in the freezer, was very easy and did the job. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes