F3
Vax Brush Bar Overload / Height Sensor Fault

Cordless Vax vacuum shows “F3” and the brush bar stops intermittently, especially on thick carpets.

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Possible Causes

Floorhead height too low for carpet pile, Excessive resistance from deep-pile rugs, Partially jammed brush bar bearings, Faulty brush bar overload sensor

How to Fix / Troubleshooting

Safety first: Turn OFF and remove the battery before working on the floorhead.

  • 1. Adjust cleaning mode: If your Vax has a hard floor/carpet selector, ensure it is set correctly for the surface.
  • 2. Clean the brush bar and end caps: Remove the brush bar and clear all hair and fibres. Ensure the bar spins freely in your hands.
  • 3. Test on a hard floor: Reassemble and test the vacuum on a hard surface. If F3 does not appear, the issue may be excessive resistance from certain carpets.
  • 4. Avoid very thick rugs: For deep-pile rugs, use a non-motorised tool or reduce pressure by lifting the head slightly.

If F3 appears even on hard floors with a clean brush bar, the floorhead’s overload sensor or motor may be faulty and the motorised head should be replaced.

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Repair Difficulty

Easy 2/5

Required Part

Motorised Floorhead Assembly
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