Hi, I hope to get a resolution for this problem that I can fix without sending the unit back.

Problem: I get an intermittent lack of full current flow. For example if I set the unit at 130 amps, sometimes when I fully depress the pedal while welding aluminum everything works fine and I get 130, then sometimes it will not go past about 20 or 21 amps even with the pedal down all of the way for 10+ seconds. It will go back and forth without touching any knobs on the machine. There is no middle of the road either. It's either full power or 20 amps. I have checked the pedal with a multi-meter. It seems to have perfect change in resistance from 0 to 70k something ohms. It does not seem to matter if the machine is cold (just turned on) or hot either.

Thanks for any input.

Buck