Shorted Hotend Fan = no fan work anymore



  • Hi there i made a mistake while i wired my new Noctua Fan.
    I shorted the + and - of my Wires directly and something blowed away (was like a silten blob) and it smelled realy awfull.

    Now the Duet Wifi still works except for the Fans.
    Any Idea what onboard gave up?


  • administrators

    If you shorted out one of the controlled fan outputs, the corresponding fan mosfet will have failed. You will probably be able to see which one. See https://duet3d.com/wiki/Connector_and_spare_part_numbers#Fan_mosfet.

    If none of the fan outputs is working, then the trace connecting the V_FAN pin on the fan voltage selector jumper to +VIN on the power input terminal block has probably fused. You can bypass it with a piece of wire on the underside of the board.



  • No one of my Fans is working anymore 😞

    Is there a way to replace the Part to get everything working like before?
    Bypassing it sounds realy bad but can you show me on a Picture how to do that anyway?

    (If i bypass it is it possible to control my Fans like before?)


  • administrators

    Use a multimeter to confirm that there is no longer any continuity between the two pins circled in red in this image. Then connect them together using a piece of insulated wire.



  • THX dc42

    My Fans are now running again.


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