Unfortunately, I find nothing but controls for it. And there are 3 versions. I had hoped to own one back a few years, but it never worked out. They are a very pricey 2 hob built in range. Suggest you contact Vollrarth on this one They are very specialized and powerfulhttps://vollrath.com/Vollrath/Parts-Support/TSR-and-CSR-Contact.htm. Being part of Hobart/ ITC, I doubt you’ll get much out of them.
Along with what fixbear said, induction warmers and cooktops are NOT field serviceable. If it’s malfunctioning, then you’ll have to send it to the factory for repairs.
If it has a remotely located control module and you know for certain that IT’S the problem, then you can probably get THAT…but only by calling Vollrath for the part number. Those simply plug into the base unit through a multi-pin connection or some unique derivative of a USB.