Richard F L Fleetwood , PA December 03, 2015 Appliance: Jenn-Air Electric Downdraft Surface Unit C221-C Jenn-Air Cooktop C221-C: Broken switch and won out control knobs. How to replace Top Burner Control Knob Kit. Removed cover and replaced swtch 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes