Lisa A San Jose , CA May 20, 2022 Appliance: Bosch Gas Cooktop NGM5055UC/01 Bosch Cooktop Ngm5055uc/01: The igniter quit working on one of the gas surface burners. How to replace Screw. We removed the top of the stovetop which was the most difficult part as all of the screws had corroded. It was then quite easy to swap out the igniter. and replace the top. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours