Hi, My Airco 250 AC DC Heliwelder V foot pedal control for arc intensity does not work. The arc is weak with minimum intensity and does not change in any foot pedal range. But if I switch to local control for the arc intensity/power setting then it works depends on where I set it. I actually burn off the tungsten tip on a high power trial.....the remote control/foot pedal for the arc ON/OFF works

Any help/suggestion to resolve this issue (what and where to look and to check) will be greatly appreciate and thanks in advance.