Problems with Lincoln LINCOLN ELECTRIC K1756-1 PRO-CUT 25 PLASMA: all settings ok, air ok will spark on occassion and then nothing. tried everything put will only lit very seldom and then nothing.???? probably 15 hours on machine now nothing/ can you buy a control board as this seems to be the problem.

Try using fine sand paper and clean the tip of electrode and the thing that looks like thimble, another solution was don't tighten tip cover too much back off a little til you ge good contact. some units don't like to be clicked ON without making contact with working metal, you may get two or three clicks and then nothing til the air stops flowing.