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  • fan not working

    It seems my fan isn't kicking on, on my millermatic 200 I'll be welding hot and it will slowly decrease to cold. Any ideas of how to check to see if my fan is still good? Thanks jake

  • #2
    Originally posted by coffinscreekcustoms View Post
    It seems my fan isn't kicking on, on my millermatic 200 I'll be welding hot and it will slowly decrease to cold. Any ideas of how to check to see if my fan is still good? Thanks jake
    You have fan on demand. It is supposed to kick in when needed, then shut off when cooled.

    There is a thermostat/thermocouple somewhere on the transformer (TP1). It could be failing. That would be the first thing I would check. Or jumper it and see if the fan stays on.

    Great machine, worth fixing.
    Nothing welded, Nothing gained

    Miller Dynasty700DX
    3 ea. Miller Dynasty350DX
    Miller Dynasty200DX
    ThermalArc 400 GTSW
    MillerMatic350P
    MillerMatic200 with spoolgun
    MKCobraMig260
    Lincoln SP-170T
    Linde UCC305 (sold 2011)
    Hypertherm 1250
    Hypertherm 800
    PlasmaCam CNC cutter
    Fadal Toolroom CNC Mill
    SiberHegner CNC Mill
    2 ea. Bridgeport
    LeBlond 15" Lathe
    Haberle 18" Cold Saw
    Doringer 14" Cold Saw
    6 foot x 12 foot Mojave granite

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    • #3
      It depends on serial number if it has fan on demand

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