F4
Bomann Tilt / Orientation Sensor Fault

Vacuum randomly shuts off when tilted or moved, F4 tilt icon appears on display

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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

Defective tilt sensor on main PCB, Loose internal connector to sensor, Firmware misreading orientation, Physical shock damaging sensor

How to Fix / Troubleshooting

Safety first: Remove the battery pack before opening any covers.

  • Step 1 – Reset the unit: Remove the battery for 5 minutes, then reinstall and test. Sometimes a reset clears sensor errors.
  • Step 2 – Check for obvious damage: Inspect the housing for cracks or signs of impact that may have affected internal sensors.
  • Step 3 – Use on stable surfaces: Ensure you are not triggering any built-in safety that stops the motor when the unit is held at extreme angles (refer to manual).
  • Step 4 – Service inspection: If F4 appears even when the vacuum is held normally, the tilt sensor or main PCB likely needs replacement.

Tilt sensor replacement usually requires full disassembly of the main body and should be performed by a qualified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Tilt Sensor on Main PCB
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