Terry B Orlando , FL January 09, 2016 Appliance: Thermador Cooktop GCT486G Thermador professional cooktop grill no longer working Replaced the ignighter and gas safety valve. Have to remove knobs, front panel and grill housing to access these parts. Read More... 16 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes Tools: Nut Drivers, Screwdrivers, Wrench Set