At work I've got a dynasty 300. It should be about an '06 vintage. It never throws this code while I am running DC but occasionally on AC especially when the tungsten gets to the point when i should change it the high freq. seems to work fine but it won't light an arc then it throws a code. I turn it off and power it back up and it will run fine until the next time. It's more of an annoyance than anything.
Is there an easy fix or something to look at or should I just run it?

The serial # should be LG030312L