There can be a few causes for a stovetop that doesn’t heat up, including a malfunctioning burner, poor gas supply, user error or a malfunctioning heating element. The best way to find the cause and resolve the problem is to schedule a service with a licensed technician.
With gas cooktops, the burners ports may have gotten clogged with crumbs or other food debris. This can be resolved by clearing the clog with a straight pin, needle or small-gauge wire.