I need a little help here. My POWERMTS 251SI which is about 1 1/2 years old and which I've just started using the TIG function consistently for about a month seems to have quit working. It started doing this thing where when I would hit the pedal it would have a really erratic looking arc, looked like just electricity coming out and I would get this buzzing noise from the machine. It would eventually arc but now it just buzzes and after about 3-5 seconds stops the buzzing like I let off of the pedal. Today I noticed the light on the panel would light red for stop and I would see code E05 which the manual says is stuck switch and too long to arc or something like that. I assume that is probably because I was just watching the panel and I had the torch in the stand, not close to any metal while pushing the pedal so I could watch to see what the panel was showing. I thought maybe my project metal I was trying to weld wasn't clean so I re-cleaned it really well and same result. I also took a fresh piece of steel and ground it clean and then cleaned it with acetone really well but still no go. Any idea what could be going on? I'm really hoping I don't have to send this back and there is a really simple fix.

Thank in advance for any help!