lower element not heating

Help Please. I have a nine year old JENN-AIR drop-in range. The lower element is not working. I have replaced it twice. The new elements do not work. the upper element works. The temp light does not indicate the correct reading. I have replace the control panel. What is causing my problem. Thank you, Bigumper

Most likely the problem is a bad relay board (#29 on the diagram).

Here are the breakdown diagrams and http://www.appliancepartspros.com/partsearch/model.aspx?model_id=43263

Gene.