Jump to content
Ultimaker Community of 3D Printing Experts

All fans on Ultimaker 2 are not working


Recommended Posts

Posted · All fans on Ultimaker 2 are not working

I am unable to get any of my Ultimaker 2 fans to turn on.

I have changed Cura settings and tried turning them on via the Tune menu, all with no luck.

I'm guessing there is a wiring issue. I've attached a picture of my control board. There are two suspiciously unplugged wires. One with a red & black wireset, the other with blue & white.

Every wiring receptacle has something plugged into it except for "ANALOG" and "TEMP2".

Any ideas?


Ultimaker 2 wiring




  • Link to post
    Share on other sites

    Posted · All fans on Ultimaker 2 are not working

    The red and black wire is for the fan on the back of the head. That needs to plug into the single receptacle that sticks up from the middle on the far side of the board. (Which will require you to unscrew the board from the frame to get at it). The blue and white cable pair is unused. The yellow green pair powers the side fans, so check that connection in your photo, and then go look at the other end of those wires above the print head.

    Pull the sheathing back at the printhead end, and look at the connectors there. the yellow and green pair supplies the power to the two side fans. The yellow and green each go into a connector at the print head end, and a short green cable jumpers them together to wire the fans in series. The side fans connect to these two via their own red/black pairs. The red/black pair coming from the electronics board connects to a third red/black pair that goes to the rear fan.


  • Link to post
    Share on other sites

    • 1 month later...
    Posted · All fans on Ultimaker 2 are not working

    Note that the 3rd fan is ALWAYS supposed to be on. It comes on even before the lights.

    The side fans can be tested by pretending to do a print - select PRINT, select anything, then go straight to TUNE menu and set fans to 100%.

    Usually the problem with the side fans (and rear fan) is with the cabling above the print head. You do not need to take anything apart - just slide up the plastic mesh covering as Illuminarti says.


  • 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

      • New here? Get ahead with a free onboarding course
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 13 replies
    • Create New...