Mark G Acton , MA January 06, 2020 Appliance: Jenn-Air Electric Downdraft Surface Unit JED8430ADB Jenn-Air Cooktop Jed8430adb: Broken stove burner control knob. How to replace Burner Control Knob. Purchased new control knobs. They arrived in 3 days, fit perfectly, and work great. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes