I looked on the web firs and saw that it might be a common problem and found quickly the culprit. The switch that control the element has a short cut. I learned from the web that it cost about $50 to replace the switch so I order it and got it quickly. The fun part is to access this part! You have to disconnect the cook top (electricity and vent) Then you have to remove the heavy top and be careful not to break it. From there you put it upside down and remove the part by observing attentively were the wire are plug into. So it is fairly easy to re-connect the new one. As I am not an expert I simply disconnected one wire at a time and re-connect one new at a time. (I also took a picture of the use part while it was connected... just in case) Then I put everything back in place, it took me a bit more than 90 minutes but I did it slowly. I also replaced the sealer under the cook top but a ticker one (rubber instead of synthetic) The cook top is 2 millimeters higher but it works fine.