Quick online research suggested two potential solutions. First was a bad switch. Easy repair, but did not fix problem: burner stayed on. Second was bad burner. Followed video instructions to remove and test burner with multimeter which revealed both elements were fine. I suspected the thermal limiter, the temperature controller in the middle of the radiant burner. Not finding this as a separate part, I spoke with customer support, was told it only came as part of the burner. Ordered, arrived, and installed in 10 minutes. It worked and now am cooking again!