I think I might be having a problem with the foot pedal that came with my 225LX. At least I think I've eliminated everything else.
I will do my best to describe what's happening so please bear with me.
What seems to be happening is a sudden, unpredictable loss and then recovery of amps. Regardless of where my foot is in the travel it acts as if I have backed off for a period of time and then got back in it. This even happens with the pedal floored. I know it is indeed backing off amps because I did a couple test while watching the amp display. When this happens I can also hear a sparking from inside the machine.
The reason I think it must be the pedal is I have tried both the stock torch and my WP 20 as well as different tungsten's and always have the same results.
However, when I plug in the button control form the stock torch (regardless of which torch I weld with) and set some up slope and down slope in to the machine I can get a nice smooth stable arc and can "pedal" the button to get a good control of the puddle. (actually getting good at that and can see where it could come in handy). Also, when I'm using the button, I don't hear any sparking coming from the machine.
The problem seems to be worse the lower I have the amp settings on the welder.
Anyone have any thoughts on this?