Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  

Hot end doesn't heat - solved

Recommended Posts

Starting up my newly assembled Ultimaker Original for its first run, the UltiController displayed a 'MAXTEMP' error and the nozzle didn't heat.

I already double checked all wirings and connections, looked on the forums here for some help.

The blower in the bottom of the printer works fine, as do the stepper motors X, Y Z and their stop ends.

So that part of the printer seems to work well.

I also tried to turn the heater in the nozzle on by hand using the UltiController (CONTROL > TEMPERATURE>NOZZLE). But it didn't respond.

I must admit that I'm not familiar with electronics so I'm stuck and need some help.

Can somebody give a hint which part to test next?

I would be grateful.


Share this post

Link to post
Share on other sites

The output at the top of the print head has a 3 pin connector which consists of ground (zero volts), power (5v I think) and a signal. The signal is 0v for 0C and 5V for 500C. So at room temperature it should read around 20C or 200mv.

If this signal is correct at the top of the UM, test it at the PCB. If it is correct at the PCB then there is probably a bad solder joint that connects that signal to the arduino - just reheat both ends of the circuit.

But more likely it seems you connect the wrong spare cable - the two cables are identical other than wire color.

Where to get circuit diagram:


The circuit diagram, and board layout are here:


There is a zip file at the top. It contains the "brd" file which is the layout. Also the "sch" file which is the schematic.

Both files can be opened by eagle software which is free:





Share this post

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
Sign in to follow this  

  • Our picks

    • Ultimaker Cura | a new interface
      We're not only trying to always make Ultimaker Cura better with the usual new features and improvements we build, but we're also trying to make it more pleasant to operate. The interface was the focus for the upcoming release, from which we would already like to present you the first glance. 
        • Like
      • 86 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 replies

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!