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  1. #1
    Join Date
    Jan 2013

    Default miller 175 keeps burnig wide open on its own

    first i new to this site so im gonna say what up.

    now for the problem. i have a miller 175 that has a tendacy to just decide to turn the voltage wide open when it wants to at times. usually when im welding something thin like body panels and stuff. when i weld something thicker i cant really tell the difference but it does do it at times. i am wondering if it is the voltage rheostat on the machine thats shorting out. im kinda curious if this is a common problem or if someone else had this same problem. i would say the machine is about 10 years old.

  2. #2
    Join Date
    Jan 2013

    Default miller 175 keeps burnig wide open on its own

    I have a Miller tig welder that had the same problem. It turned out that a relay inside was worn out. Actually the points on the relay would stick closed because they were arcing. I was able to take the relay apart, sand the points and get it working again. Eventually the relay had to be replaced.

  3. #3
    Join Date
    Sep 2005
    Appleton, WI


    The voltage control pot on the Millermatic 175 is a 50K ohm, I would definately start there for t-shooting it.
    Kevin Schuh
    Service Technician
    Miller Electric Mfg. Co.

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