Hello- The bobbin sensors constantly go off even if the bobbin is fine. We have changed both and upgraded one. No difference. We have just turned them off which is a pain. Any help would be appreciated. Thanks, Mike VISIT OUR WEBSITE ! @ _campusemporium.com_ (http://www.campusemporium.com/) Campus Emporium Mike & Bobbie PH 540-552-1051 FX 540-552-2464