David L Electra , TX January 31, 2021 Appliance: Frigidaire Refrigerator FFUS2613LS6 Frigidaire Refrigerator Ffus2613ls6 / : Frig was warm/freezer good. How to replace Defrost Thermostat Kit. Defrost control thermostat. 11 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes