The LF burner on this smooth top range will not turn off. Everything else about the range works perfectly. This model does not have infinite switches. It has a touch pad that you use to increase the setting. The left burners also work in conjunction to increase the size of the burner all the way from front to back using a bridge burner. The bridge burner and rear burner work correctly and do turn off. This leads me to believe that the relay on the power board for the front burner only has fried internally and cannot turn off. I assume the power board needs to be replaced but cannot find anything to confirm this. Have you heard of this before?