Jump to content

Nozzle does not stop heating, UMO


Recommended Posts

Posted · Nozzle does not stop heating, UMO


I have problems with my nozzle and the temperatur.

The nozzle heats up, but it does not stop heating. Last time I needed to replace the thermocouple as it was destroyed because of the extreme heat. Then I changed the thermocouple and I could print again. This morning I wanted to print again, but same problem, the nozzle heats up without limit.

At the ulticontroller there is no display about the actual nozzel temp it just shows 20 degrees, which can not be true.

There is no errror massage at the ulticontroller.

Could anyone please assist me to get this work again.

Kind regards




  • Link to post
    Share on other sites

    Posted · Nozzle does not stop heating, UMO

    Did the thermocouple fall out? Check that first.

    There are many things that can cause this so you need to isolate.

    Measure the voltage coming from the top of the head. The voltage should represent the temperature "directly" like this:




    Then heat up the head so that it feels warmer (at least 30C) and measure the voltage again.

    If the voltage is correct (voltage goes > 300mv) then the problem is in the cabling or underneath the UMO. If the voltage stays at 200mv then the problem is at the circuit board or the thermocouple. This is a first isolation step.

    If you don't have a voltmeter, find someone who has one and have them show you how to use it (have them do the measurement!).


  • 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

      • 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
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 8 replies
    • Create New...