Read your post from a few years back on the help 3 issue on the Millermatic 350P, I was recently given the same machine with identical problem.
It fires up as it should, but 3/4 seconds after each trigger pull, “Help 3” error code comes up, with maybe a static spark at best with wire contact to potential practice piece. A few seconds and a double trigger click, and well…wash, rinse, repeat so to speak.
Given your success, I was hoping you would be willing to send some help my way. I don’t have an electronics background ( vocational electric in high school, but I can test. Any chance of bringing this machine back to life?! Guess I’m just too stubborn to give up on such an otherwise great machine.
Thank You So much for any help in advance.