Susan K Jaffrey , NH November 13, 2014 Appliance: Thermador Cooktop GGS30W Thermador Cooktop Ggs30w: Only two burners would light: the two that had no dimmer control. How to replace Simmer Control Kit. Internet research, and, once again, talk with very knowledgeable Appliance-Pro employee. He confirmed my diagnosis, identified the part, and shipped it immediately. Still waiting for someone to have time to install the part, but I now have it on our island. The responses are guesstimates. Living on a remote island with frequent power surges, we often have electronic problems with major appliances. AppliancePartsPro is our hero! ..... I never look elsewhere. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes