Howard H Irondequoit , NY June 05, 2023 Appliance: Model RF23HSESBSRSR/AA The unit is not defrosting. The defrost fan not working. Replaced the defrost thermostat and temperature sensor. Currently removing the ice build-up, had to take off the back panel. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours