A:Answer Hello- Thanks so much for checking with us. Your cast iron pans can be used inside the oven, but they shouldn't be used on top the cooktop. If the cookware has a burr or rough spot, it will scratch the glass surface. Additionally, it is slow to absorb heat. Once this type of cookware heats up, especially on high heat, it holds an intense amount of heat which is transferred to the cooktop. This can cause the element to shut down as a response to the temperature limiters which indicate the surface temperature is too high for the cooktop components to handle. We hope this is helpful! If you have any questions in the future, please let us know. We are here to help! Joyce@GEA