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.
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