My equipment, Miller CST 280 has a trouble, it turn on ok, but when I star to weld, it make a arc only when I touch electrode with workpiece (only touch), next the machine turn off, because led blue light off, later 1 second the machine turn on again, and same condition.

I repaired my Lincoln 200i, using technical manual.

I have technical manual for Miller MaxStar 150 ST STL and STH
I can exchange if someone want like this.

Best Regards,