An issue that owners of old Thermador ovens sometimes run into is a bad sail switch. These switches are used to detect when the cooling fans are on. If the fans are not on, the cooking elements will not work. This is an important safety feature, but it also means that the oven will not work if the switch stops working. Unfortunately, Thermador no longer manufactures many of the sail switches that are found in their old ovens. However, our light force sail switch can be used as a substitute. You can find used switches on eBay that would also work, but many of them go for around $100. Either way, there’s no sense in replacing an entire oven just because one small switch stopped working.