the high frequency stays on

[greenfield]

I have a miller dynasty 300 tig machine. My problem started one day when I turned it on and finished my first weld the gas kept flowing. When I tried to weld again the high frequency would not work to help strike an arc. Later I opened the cabinet to blow it out. When I turned it on to weld again the gas is going on and off but when I weld the high frequency stays on the whole time. The settings are the same as always best I can tell. Thanks for any help.

[Steve]

Post the machine serial number I'll look into it.,

[greenfield]

Good Morning. The serial number is LE280329. Thanks a lot.