ER65 - Flow sensor error

The flow sensor of the Ultimaker S5 signals that filament is not flowing as predicted. The Material Station has not yet determined end of filament, something else is wrong. Most likely, the filament path is impeded.

This could be due to:

  • Clogged print core
  • Wrong spring tension Ultimaker S5 feeder
  • Faulty, blocked or dirty Ultimaker S5 feeder
  • Obstructed Bowden tubes
  • Adjusted print settings

 To troubleshoot, please do the following:

  1.  Verify that your print core is not clogged. You can do this by following our guide on print core cleaning found here: Clean the print cores
  2. Check the Ultimaker S5 feeder tension.
    If incorrect, reset the tension of the feeder by turning the bolt in the top of the feeder, until the indicator is at the middle mark.
  3. Perform maintenance on the affected feeder. You can do this by following our guide on cleaning the feeders found here: Clean the feeders
  4. Check if the Bowden tubes are freely accessible. If this is not the case, please replace the Bowden tubes as found here: Replace the Bowden tubes

Tip: The filament path of the Material Station could also be obstructed with filament. For step-by-step instructions (including photos) on how to remove the broken PVA from the system, read the troubleshooting guide on this page.

Check the rotating magnets of the feeder

The flow sensor has a rotating magnet. The rotations of the magnetic can be read by the connected PCB and the generated flow can be calculated. Correct alignment of the magnets are important for correct reading of the PCB. In the following picture, you can see a flow sensor in which the rotating magnet is level in the cylinder (left), and also one in which the rotating magnet is not correctly aligned (right):


In the following picture you can see the magnet up close. The aligned magnet on the left picture is the correct position, and in the right picture the magnet is not fully level. This is causing it to interfere with the PCB, and therefore with the flow sensor readings:

Feeder2_magnet_vs_PCB.png  Feeder1_magnet_vs_PCB.png

If your flow sensor is affected by this, please get in contact with support and provide supporting images. A support representative will help you restore full functionality.

Still encountering the error?

 If the problem still persists, please contact support by raising a support request above and describe your case as detailed as possible. Please share: how often the error is raised, log files, materials used, and outcome of above troubleshooting.

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