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  • 251 wire feeder

    Hello I'm new to this and I bought a millermatic 251 not running put a power cord on it and the fan comes on and I get a hot smell where do I start the diagnosis thank you

  • #2
    Fan comes on as soon as I flip the switch nothing else

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    • #3
      Model NUMBER
      Serial NUMBER
      Made by "Miller Electric"
      or Miller?

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      • #4
        Serial number LC620568
        millermatic 251

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        • #5
          Open it up and look for something getting hot.

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          • #6
            Try opening up welder and use a digital temperature gun to scan the boards and wires to find out where the unwanted heat is coming from.

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            • #7
              I can't say I remember my 2003 model 251 fan staying on all the time.

              https://forum.millerwelds.com/forum/...-fan-on-demand

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              • #8
                Originally posted by tackit View Post
                I can't say I remember my 2003 model 251 fan staying on all the time.

                https://forum.millerwelds.com/forum/...-fan-on-demand
                You are prob right.
                Bob Wright

                Spool Gun conversion. How To Do It. Below.
                http://www.millerwelds.com/resources...php?albumid=48

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                • #9
                  I've opened it up and and done slot of looking on the internet. I think I found the rectifier bad so I have that ordered not sure if that is all that is wrong still going to test other components

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                  • #10
                    I hope you found the problem, many times there is a series of problems which go undetected but are part of the problem.

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