Seaborn H Conroe , TX November 20, 2016 Appliance: Thermador Gas Range PRG366US Thermador Range Prg366us: Oven failed to light broiler also didn't light for a year before oven failed burner ignitor loose. How to replace Nut. Replaced both ignitors. Since I was working on the range I also overhauled the final 2 of the 6 burners on the stove top. Venturi tube and jet nuts were frozen and could not remove drip tray for cleaning and access to ignitor clip. Had to drill out Venturi tubes using a tapered bore bit. Used Dremmel with cutting wheel to remove jet nut. This range has been heavily used since new for 16 years. Works like new, again. 4 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours