I went on a no heat service call in a mobile home with electric furnace. I found one of the 60A DP breakers on the heater gone bad and replaced it. Everything worked worked fine for a day and they call me backed complaining that it wasn't heating as good as it had been. Went back and found one of the sequencers gone bad. When replacing the sequencer my son placed the fan wire on the line side of the sequencer by mistake so the fan did not shut down but ran continuously. He found the problem and corrected it and put the furnace back in operation. We turned the stat down and observed that the fan cycled off. As he was putting the panels back in place we noticed what sounded like one of the sequencers closing and energizing one of the elements. The 5kw strip would cycle on and off with no call for heat. Checked for 24V on the sequencer and found none. We pulled the wire from the sequencer feeding the element and still observed a 20A draw on the other side. Needless to say we were amazed at this point. Pulled the element out and found the element grounded to the frame at about mid point of the element. What we were hearing was the high limit cycling off and on. Exactly half of the element was heating up through the grounded portion of the coil. You would think that the element would have just burned out at the contact point with the frame. First time I have ever seen this.