You need to replace the capacitor in the foot control. It's a matter of using the soldering gun to remove the capacitor and then re-solder a new one in. We were getting out capacitors from Radio Shack, but don't know where to get them now. I had stocked up, but we're out. When that foot control needs to be replaced, we wire in an "Electronic" foot control -- part #001352109. It looks tacky, but works great.