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It is a faulty connection on the pick up wire. The green wire is located on the back side of your output stud. Take it loose, clean it up and secure it snuggly. Your machine will idle up. Your weld.idle board L8484-3 controls output and idles the machine down.
Rebuilt L8484 $116.25 (by Innovat Corp in Virginia 90 day warranty)
New OEM $204.61
But like I said its not your board. Its a faulty connection. I see it everyday.