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Several things can cause this, but the most common is just a burnt-out element. If a glass top, you will need to disconnect it from the power source, open the top with the perimeter screws, and put a new element in. They vary in price based on the brand and size but are easy to replace. It could be a switch as well. But, 9 out of 10 times, it’s an element that went bad. If you have a meter, you could test it at the element side.