sorry if this is in the wrong section, hopefully the admin can move it if it is.

anyway i have a maxstar 150 stl welder. iv been using it as a stick welder since i bought it and decided to try tig welding. i bought the regualtor tourch and gas but im having some problems. the welder works fine when im stick weldign but when i select the lift start the ready light wont light up (doesnt blink or anything). the lift start indcator lights up but nothing else. no spark, no arc, nothing. then i switch it back to stick and it works perfectly. am i doing something wrong or is my welder broken?