Welder is a Cigweld Weldskill 200 AC/DC. We finally got a foot pedal for it ( Cigweld W4015825 which is the correct pedal for the machine ). I plugged it in and it doesn't work correctly. When the hand piece control is plugged in, you can turn the knob on the welder and set the max current. when I unplug the hand piece control cable and plug thefooot pedal in, that max current number on the digital screen slowly goes down to 5, then you can't change it, turning the knob does nothing. More often than not it doesn't weld properly, and theft pedal doesn't increase / decrease the current like it should. Am I missing something in the settings, for something else wrong? or operator error?