Gordon D Alton , IL July 25, 2020 Appliance: LG Gas Range LRG3091ST/00 Lg Range Lrg3091st/00: Error code f11 (oven temperature sensor or thermistor). How to replace Thermistor. Easy ''bolt in swap''. I did enlist the help of a ''You-Tube'' video which was a great help. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes