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Thread: miller 251

  1. #1

    Default miller 251

    I have a miller 251 welder that when I weld the gas keeps shutting off about every 5 seconds and it will come back on when I hit the trigger anybody know what is wrong with it. Thanks

  2. #2
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,618

    Default

    Likely the gun has a shorted trigger to the internal conduit. Easily tested by meter testing the trigger to machine connector to the copper connector on the gun.

  3. #3

    Default

    Quote Originally Posted by cruizer View Post
    Likely the gun has a shorted trigger to the internal conduit. Easily tested by meter testing the trigger to machine connector to the copper connector on the gun.
    That is not the problem I have a old gun and I put it on and it does the same thing.

  4. #4
    Join Date
    Feb 2012
    Posts
    1

    Default miller 251

    Miller has a feature where if u aren't welding it shuts the gas off so u don't waste gas when the trigger is pulled. Either u aren't welding, there is an issue with that sensor or the solenoid is bad.

  5. #5
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,618

    Default

    Seen lots of machines where the gas inlet screen is plugged with bits of teflon tape. Might be your problem. So the gun would get the inrush then go down to nothing. Retrigger and get the inrush again.

    Teflon tape is NOT supposed to be used on brass fittings as the saying goes "Brass seals brass".

  6. #6
    Join Date
    Jul 2010
    Location
    Four Flags city
    Posts
    298

    Default

    I just ran into a regulator that came with a new Miller machine that worked fine but would not read tank pressure.....teflon tape in the gauge orfice.

  7. #7

    Default

    Quote Originally Posted by big mike View Post
    I just ran into a regulator that came with a new Miller machine that worked fine but would not read tank pressure.....teflon tape in the gauge orfice.
    I put meter on the wires going to gas solenid and the power is going off every 5 seconds.

  8. #8
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,618

    Default

    Then you have a main board problem, something is heating up, and dropping power out to the solinoid.

  9. #9

    Default

    Quote Originally Posted by cruizer View Post
    Then you have a main board problem, something is heating up, and dropping power out to the solinoid.
    Do you have to replace the main board and is this something you can do yourself. Thanks

  10. #10
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,618

    Default

    Order it up (www.miller4less.com ) and do it yourself...

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