After working with tech support since March finally got somebody to listen, pull trigger air flows but no plasma. as I said got RMA and since it's everlast had to pay shipping; 6 weeks got the ( sorry 3 in 1 Combo Welder Everlast PowerPro 256d ) back had to pay shipping again. Used it for 30 min ( plasma ) heard crack from unit and no plasm and no air when trigger pulled. Bought anothe with a 3 year warranty and they pay shipping BOTH ways