i tried this on the miller forum with no luck my buddy has a miller 330 A/BP with high freq it started where you would press the foot petal and the high freq start would come on then it would just hold a little arc you could move the amperage range selector back and forth and it would do right that went on for a while and now it does it all the time no matter what weve tried blowing it out changed foot pedalsComplete Fabrication Shop specializing in pipe fabrication. Also offering heavy steel fabrication and sheet metal work.