Why can't I make caramel or toffee on my glass topped stove? I have tried different pans, different thermometers, stirring, not stirring, different recipes, different temperatures. It turns out scorched, rock hard, or, in the case of toffee, it separates. I used to make good caramel on my old electric stove.
How are you trying to make the caramel? Using only sugar, put it in the pan over a high heat and stir continuously. It will start to crystallize, and even form crystals up the side of the pan, but be patient, it will caramelize. There really shouldn't be an issue, I use a glass topped stove, normally with a heavy based stainless pan.