Hi,and welcome, i too own a Tig Wave 250, First do you have the owners manual for your machine? Yamaha Xv 500 Service Manual download free. Saratoga Spa Repair Manual download free. If not you can, i think down load a copy from Thermo Arc, if you cant down load it i know for sure that they will mail you a copy (for free) or you can call them and they will email you a copy. Once you have the manual you will be able to check to be sure that you have all of the machines switches set to the right spot. I know that this sounds silly but sometimes things are that simple. A TA list of obsolete manuals Cap N, in the past I've done quite a bit of searching through Thermal Arc's literature pages and can give you a headstart on where to look for your manual.