James T Portland , OR May 02, 2018 Appliance: Jenn-Air Self Cleaning Slide-In Electric Range JES8850AAQ Jenn-Air Range Jes8850aaq: Relatively poorly manufactured control knobs on range were all breaking a local dealer was asking an exorbitant price for replacements I received oem replacements at almost one third of the price. How to replace Burner Control Knob. It was very simple to replace the control knobs based on the part numbers shown in the diagram for the model of the range on the AppliancePartsPros.com website. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes