Jump to content

Ultimaker 3 Bed Temp Sensor Issues


Recommended Posts

Posted · Ultimaker 3 Bed Temp Sensor Issues

My school has recently purchased an ultimaker 3 and I am mostly in charge of it, and recently it has been displaying incorrect temp readings for the build plate. Even though the build plate is cool to the touch and not on, it says it is at 150C/0C. This is a problem because when I try to print, the temperature gets added to the 150 and tells the printer it is at max temp, it then stops printing. I have tried everything from updating software, factory resets, and temp calibration.

  • Link to post
    Share on other sites

    Posted · Ultimaker 3 Bed Temp Sensor Issues

    This is a common problem and easy to fix (well I'm an electrical engineer).  Basically there is an increased resistance somewhere in the path of the temp sensor which starts at the circuit board under the printer and goes to the bed through obvious wires (in that black sheathing) and through a connector to the board itself.  The board is extremely unlikely to fail - the most common failure point is at either connector - wires can come loose and the connector itself can disconnect (barely) from the board.


    I'd start by watching the temp while you poke around with your fingers where the wires connect to the board - it's at the back of the heated bed - 4 individual wires - the 2 smaller ones are the sensor wires.  Push and pull and if the temperature changes suddenly then great news - you found the problem area.  You can repeat for the circuit board but that requires removing the bottom cover (not that hard).


    Assuming the problem is at the bed - you can take the bed all apart pretty easily by removing the 3 leveling screws.  Start by removing the glass, then undo the 3 leveling screws comlpetely.  Watch out for washers and really pause and stare at how it goes back together.  Lay the parts out in a safe spot where you won't bump them and lose what order they go.  Often a washer sticks to the plate (the grease acts as glue).


    Once the wire is loose - remove and reinsert the 2 temp wires and power the printer up again to see if fixed.  Report back.

  • 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 5.8 beta released
        Another Cura release has arrived and in this 5.8 beta release, the focus is on improving Z seams, as well as completing support for the full Method series of printers by introducing a profile for the UltiMaker Method.
        • 1 reply
      • Introducing the UltiMaker Factor 4
        We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
          • Like
        • 3 replies
    • Create New...