My plasma cutter stopped cutting. The loose-nozzle indicator light was
on. The nozzle was tight, but I loosened & re-tightened it and it
started cutting again. Then stopped again "loose nozzle" again.

So I opened the torch & checked the nozzle switch - it was OK. Crap!
Now it was something in the hose, or worse - in the electronics. So I
got out the manual to look for a schematic. And stumbled across the
page with the indicators explained. 'Turns out that "loose nozzle"
means a loose nozzle only when steady. When it's flashing, as mine was,
it means worn electrode!

So I put in a new electrode & nozzle and I'm all set. 'Least I didn't
start taking more stuff apart.

Kick me,
Bob