Grace H Bryan , TX August 17, 2020 Appliance: Frigidaire Refrigerator FGUS2642LF1 Frigidaire Refrigerator Fgus2642lf1 / : Temperature in refrigerator hot then cold. Ice dispenser did not work. How to replace Defrost Thermostat Kit. First replaced the defrost thermostat, then replaced the Board-Switch. One of the easiest appliance repairs I have ever completed! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes