I just received my 250EX and have been trying the different features. The machine seems to run well but I've noticed something weird with the digital display. I was welding some header tubing and had the machine set at about 60 amps with the pulse on. On finishing a weld I happened to glance at the display and it was at 103. After about 5 or 10 seconds (it seemed like an eternity) it returned to 60. I tried it a number of times and got the same thing whether I had the pulse on or not. I then watched the display when starting an arc and as soon as I pressed the trigger the display went to 103. As soon as the arc was established the setting returned to 60 where it had been set. I haven't tried a higher setting to see what happens. Has anyone else noticed this with their machines? I don't understand why the reading would jump to 103 and then return to what I set.

One other question. When I got the machine I wired it with the black and white as the hot leads. When I hit the switch, nothing. I tried the black and red thinking that might work and nothing. Finally I tried the red and white and the machine fired up and seems to run OK. I've read that the black and white are typically the right leads to wire up, that's why I started there. Anyone else have to use the red and white leads?