Dwayne B Huntington , TX February 29, 2020 Appliance: Frigidaire Refrigerator LGHT1846QE1 Frigidaire Refrigerator Lght1846qe1: Stayed in defrost mode way to long. How to replace Refrigerator Defrost Timer. I noticed when unit was actually working there was frost on the rear wall of freezer. I went ahead and replaced the defrost timer, defrost thermostat and heater. Unit works really well now. All the parts are very easy to access and replace. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes