I went to weld aluminum last night the HF works but will not start the arc. I use the plasma alot and had an aluminum job come in.
It will weld in DC. I tried both the pedal and torch switch. I tried switching from 2t to 4t I tried every knob and switch every which way. I can hear the argon flowing through the torch. The gap on the hf points seem to be good. Good ground, No loose connections. Im stumped at this point any other ideas?

Thanks
Kevin