Flow sensor error - ER65

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

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.
  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.

If the problem still persists, please contact your local service provider for assistance.