As stated previously, check for power to the element if your heat indicator light is on. You can confirm a bad element by checking for continuity and resistance on the actual element, but by the time you remove it, you're better off replacing it, especially if it is the original 2007 element. I haven't checked in a while, but it should cost you around $50 for the element depending on wattage. Most other problems will throw some type of code, such as temp sensor (common maintenance item), flow sensor, etc.