F20
Dyson Brush bar speed sensor or feedback fault

Robot displays F20 and may not detect or control the main brush bar correctly.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed brush bar tachometer sensor, Broken sensor magnet on brush bar, Damaged brush motor harness, Main board input fault

How to Fix / Troubleshooting

Safety first: Turn the robot OFF and flip it over before working on the brush bar.

  • Remove brush bar: Take out the brush bar and inspect the ends for a small magnet or encoder ring. Ensure it is intact and not loose.
  • Clean sensor area: Near the brush motor, look for a small sensor opening. Remove dust with a soft brush.
  • Reinstall and test: Refit the brush bar and run a short clean. If F20 persists, the sensor or motor assembly may need replacement.

Brush bar speed sensing components are usually integrated into the cleaner head; replacing the entire cleaner head assembly is often the most practical repair.

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Repair Difficulty

Hard 4/5

Required Part

Cleaner head / brush bar motor assembly
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