I bought my powertig 250ex about 5 or 6 months ago and it didn't come with a plug end so I went out and bought a NEMA 14-50P to go into a hottub receptacle. The receptacle says 230V but when i try to weld with it I only get a very very tiny spark when i touch the tungsten directly to the aluminum. I also don't hear the high freq. kick in until about 15 seconds after pushing the pedal down fully. There's also no gas flowing whatsoever. I have no idea why these things aren't working. Any recommendations would be greatly appreciated.