F5
Bomann Motor Overheat / Overcurrent Protection

Vacuum emits a burning smell and F5 appears, unit shuts down quickly

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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

Worn motor brushes (on brushed DC motors), Shorted motor windings, Severely blocked cooling vents, Failing motor bearings causing drag

How to Fix / Troubleshooting

Safety first: Immediately switch OFF the vacuum, remove the battery pack, and allow the unit to cool. Do not continue to operate a vacuum that smells like burning.

  • Step 1 – Check for blockages: Inspect and clear all airways, filters, and vents as described for other blockage errors.
  • Step 2 – Inspect motor area: Smell near the motor housing (with battery removed). A strong burnt odor localized there suggests motor damage.
  • Step 3 – Listen for abnormal sounds: After cooling and reassembly, briefly test the vacuum. If you hear grinding, squealing, or sparking noises, stop immediately.
  • Step 4 – Do not disassemble motor: Motor repair is not user-serviceable. Continued use can cause further damage or fire risk.

Arrange for professional service to replace the main DC motor assembly. Also have the main control PCB inspected for heat damage.

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Repair Difficulty

Professional Required 5/5

Required Part

Main DC Motor Assembly
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