Jump to content

Help diagnosing UM3 front fan not running

Go to solution Solved by FSund,

Recommended Posts

Posted · Help diagnosing UM3 front fan not running

We have a UM3 at work that I'm trying to get working.


I think I've nailed down one of our issues to the front fan not running.

  • If I heat a print core to 60 degrees via the menu, the fan does not start, and I measure 0 V at the connector on the back of the print head
  • If I plug the front fan into a connector for one of the side fans, the fan spins up when I manually set the fan speed in the menu
  • The front fan spins freely if I blow on it


Should I just go ahead and order a new print head board, or is there something else I can try?

  • Link to post
    Share on other sites

    Posted · Help diagnosing UM3 front fan not running

    Hey @FSund,


    Welcome to the Ultimaker Community 🎉


    Hardware replacements are not my strong suit.
    But I do have access to the assembly manuals. 

    UM3 - Replacing the axial fan.pdf

    If that doesn't work there might be a broken part. 

    Then it's better to reach out to our support experts.

    You can create a ticket here: 


  • Link to post
    Share on other sites

    Posted · Help diagnosing UM3 front fan not running

    I also had a fan issue which ended up being very fine strings of material caught in the inner bearing of the fan, i had to remove the fan which is quite difficult and you risk breaking some solder joints, its easily repaired though with a soldering iron. I removed all the material of which there was A LOT compared to what i could previously see. Everything's been working fine for months after this.

  • Link to post
    Share on other sites

    • Solution
    Posted · Help diagnosing UM3 front fan not running

    Turns out I had swapped the front fan and auto leveling sensor connectors 🤦‍♂️ The fan works as expected after swapping them around.

    • Like 1
    Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • UltiMaker Cura 5.7 stable released
        Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more. 
          • Like
        • 18 replies
      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
    • Create New...