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Contact Miller Electric on their website. If you want a Technical Manual, Miller doesn't sell those to the public. They're only available to authorized repair facilities. If you're interested in purchasing one, contact me with the serial & model numbers. I may have it in PDF format.
Radnor is a registered brand by the gas company Airgas, but any schematics of a 17V F tig torch will do here it is: check Page two, part numbers are standard for all torches. http://www.ckworldwide.com/form105/p2_3.pdf
From the user manual for a generic dynasty model welder: 2 Help 2 Display Indicates an open in the thermal protection circuitry located on the left side of the unit. Contact a Factory Authorized Service Agent if this display is shown.
So you could have anything from a broken or disconnected wire to a bad thermal switch.
You can get user manuals specific to your welder at www.millerwelds.com
Go to your local welding supply store. A TIG welder is a specialized welder that cannot be found at a building supply store. Stores like Maine Oxy-Acetylene Supply or Grainger Industrial Supply will carry them. Look in the classifieds of publications like Uncle Henry's. There you might find a TIG welder that someone is selling—and it may be at a good price. Be sure to ask the owner questions and take a look at the TIG welder before buying it. Explore eBay. Yes, even eBay has TIG welders. You'll need to ask the buyer questions about the welder's history and more. Perhaps, if the seller is near enough, you might be able to pick up the TIG welder yourself and save on shipping. Visit online retailers. Retailers like Welders Direct or Welding Mart carry TIG welders and would be able to answer any questions you might have (see Resources below). Consider the manufacturer of the TIG welders themselves. Lincoln, Miller, Hobart and others have their own websites. Call the companies directly and ask a lot of questions. These vendors are the best product source for welders (see Resources below).