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  • #1

    My 150STH will not power up

    Just like it says in the subject, went to turn on my 150STH just now and got absolutely nothing. The power source is fine. It worked fine yesterday when I used it, made no odd noises, didn't smell funny, no signs of trouble. It didn't make any sounds when I flipped the switch either. I didn't hear anything like a breaker tripping. I've had it plugged into the same location in my basement for several years now. It never moves and has always been complete trouble free until tonight. I've never had this thing open, and I'm at a loss as to what to do here. I need to get some work done, so I'd love some help ASAP! Thanks a bunch!

    Tom
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  • #2
    First off... I would post the serial number.....

    Then if you have not already done so... download the correct manual here...

    https://www.millerwelds.com/en/suppo...uals-and-parts



    Have you tried resetting Breaker "CB-1" on the back of your Maxstar..??

    or checked the power switch with a meter...?? it is not unheard of for those switches to wear out.. after how many cycles..??
    Last edited by H80N; 11-09-2015, 06:05 PM.
    .

    *******************************************
    The more you know, The better you know, How little you know

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

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    Dynasty 350DX Tigrunner
    Dynasty 200DX
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    • #3
      The serial number is LE350221M.
      I have looked through the manual. In the troubleshooting section it says to replace fuses or reset breaker. On the back of the welder there is a power switch, the connection for the gas line, and the power cord. There is no breaker. The manual does not indicate that there is a breaker anywhere on the outside of the machine, either, unfortunately.

      Comment

      • #4
        Originally posted by gearhead69 View Post
        The serial number is LE350221M.
        I have looked through the manual. In the troubleshooting section it says to replace fuses or reset breaker. On the back of the welder there is a power switch, the connection for the gas line, and the power cord. There is no breaker. The manual does not indicate that there is a breaker anywhere on the outside of the machine, either, unfortunately.
        The owners manual does not show Breaker CB1.... but the parts book does

        https://www.millerwelds.com/files/ow...42R_PT_MIL.pdf

        Lookat item #37 on page 2 and 3...

        BTW... the manuals for newer revs of the 150sth DO show the breaker on the back panel...

        See Figure "5.2 Overload Protection" on page 18 0f the manual (page 24 of the pdf)

        https://www.millerwelds.com/files/owners-manuals/O2242AA_MIL.pdf


        does your back panel look like that...??
        Last edited by H80N; 11-09-2015, 07:18 PM.
        .

        *******************************************
        The more you know, The better you know, How little you know

        “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

        Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

        My Blue Stuff:
        Dynasty 350DX Tigrunner
        Dynasty 200DX
        Millermatic 350P w/25ft Alumapro & 30A
        Millermatic 200

        TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000
        • Likes 1

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        • #5
          Well, Just my own experience. My Maxstar 150 quit working after the previous day of doing fine.Thought it was toast, checked the input power with a volt meter and found out to be the power switch got too hot and melted a bit.The contact would not make a connection correctly, put new switch in and still going 5 years later.
          2- XMT's 350 cc/cv
          1- Blue star 185
          1- BOBCAT 250
          1- TRAILBLAZER 302
          1- MILLER DVI
          2- PASSPORT PLUS
          1- DYNASTY 200 DX
          1- DYNASTY 280 DX
          1- MAXSTAR 150 STL
          1- HF-251 BOX
          1- S-74D
          1- S-75DXA
          2- 12-RC SUITCASES
          1- 8-VS SUITCASE
          2- 30 A SPOOLGUNS
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          • #6
            It's either the power switch, cord or the main board. If you are getting your power threw the power switch its the main board.

            Comment

            • #7
              Thanks to you all for the help, and special thanks to H80N for the details and links to manuals. For the record, I compared the diagrams, and mine definitely does not have a breaker on the back, not even in some kind of weird, half-hidden way. Apparently, that's a design change that came along later.

              But I solved the problem! Thanks to all your input, I opened it up and did a voltage test across the switch, and as I was doing that there was a quick buzz, and then the power came back to the unit. It's definitely related to the power switch, nothing more serious than that. Really glad it's not the board!

              So where do I get a new power switch from? Thanks again for all the help!

              Comment

              • #8
                Originally posted by gearhead69 View Post
                Thanks to you all for the help, and special thanks to H80N for the details and links to manuals. For the record, I compared the diagrams, and mine definitely does not have a breaker on the back, not even in some kind of weird, half-hidden way. Apparently, that's a design change that came along later.

                But I solved the problem! Thanks to all your input, I opened it up and did a voltage test across the switch, and as I was doing that there was a quick buzz, and then the power came back to the unit. It's definitely related to the power switch, nothing more serious than that. Really glad it's not the board!

                So where do I get a new power switch from? Thanks again for all the help!
                Try these guys.... just enter your part number....

                Welcome to Miller4less
                http://miller4less.com/
                Shop Miller4less online. Miller4less
                .

                *******************************************
                The more you know, The better you know, How little you know

                “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                My Blue Stuff:
                Dynasty 350DX Tigrunner
                Dynasty 200DX
                Millermatic 350P w/25ft Alumapro & 30A
                Millermatic 200

                TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000
                • Likes 1

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                • #9
                  Looks like this one
                  208550 [1/PK] SWITCH,ROCKER DPST 16A 250VAC ON-OFF BLK PANEL MTG $5.08

                  Context Root Not Found
                  http://miller4less.com/product_info.php?products_id=6803

                  .

                  *******************************************
                  The more you know, The better you know, How little you know

                  “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                  Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                  My Blue Stuff:
                  Dynasty 350DX Tigrunner
                  Dynasty 200DX
                  Millermatic 350P w/25ft Alumapro & 30A
                  Millermatic 200

                  TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000
                  • Likes 1

                  Comment

                  • #10
                    Just for the record, the parts book says the CB1 breaker was effective starting with serial number LH500215J.
                    Miller stuff:
                    Dialarc 250 (1974)
                    Syncrowave 250 (1992)
                    Spot welder (Dayton badged)

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                    • #11
                      Got my new switch ordered. From a different site, but thanks for the help H80N and all the rest as well!

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