There was a sensor error within the print head - ER21

This error can show up during the active leveling process. It means that there is a problem with the capacitive sensor of the print head, which is used for the active leveling.

Simply power cycling the printer and re-doing the process can help resolving the issue:

  1. Reboot the Ultimaker 3 by using the on/off button
  2. Re-do the active leveling and check if the error has disappeared. Make sure to not touch the Ultimaker 3 during the active leveling

If the error does not disappear, you can contact one of our local service providers for further help.

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