Cathy D Fenton , MO April 16, 2024 Appliance: Model UNKNOWN; GOD FORBID THEY PUT IT SOMEWHERE VISIBLE F 9 error code on lg range not keeping correct temperature internally Replaced the thermistor in a 15 min easy fix (only 15 min because my model had a metal plate on the back that needed to be removed to do the replacement). Limited usage since then, but everything seems to be working much better, temperature-wise. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes