I haVe the 2x2 growth series table I'm trying g to make my first line test the dry run goes fine. I go active and it drops down the ohmic sensor detects my steel. The torch lights makes a pierce. Stays on for 10 or 15 sec arc goes out air flows for another 20 sec then .nothing. Last call to Lincoln was to make sure plasma was on second mode from the top. It is but I've tried all 4 modes...no change. Help.