Vacuum stops during use and E3 appears, unit feels hot to the touch, will not restart for several minutes

Safety first: Turn the vacuum OFF, remove the battery pack, and allow the unit to cool for at least 30 minutes before handling internal parts.

• Step 1 – Let the unit cool: Place the vacuum in a cool, dry area away from direct sunlight. Do not cover it while cooling.
• Step 2 – Empty and clean dust bin: Remove the dust container and empty it fully. Wipe the inside with a dry cloth to remove fine dust.
• Step 3 – Clean all filters:
  • Pre-motor filter: Tap off dust and, if allowed by the manual, rinse with lukewarm water. Let it dry completely (24 hours).
  • HEPA exhaust filter: Remove the rear HEPA filter. Tap gently to remove dust. If it is heavily discolored or damaged, replace it with a genuine Bomann HEPA filter for your model.
• Step 4 – Check air vents: Inspect all cooling and exhaust vents on the motor housing and body. Use a soft brush or vacuum to remove lint and dust.
• Step 5 – Reduce load: When you resume use, start on a lower power setting and avoid pressing the nozzle tightly against carpets or upholstery, which restricts airflow.
• Step 6 – Monitor for recurrence: If E3 reappears quickly even with clean filters and good airflow, the thermal sensor or motor windings may be faulty.

Persistent overheating indicates a deeper electrical issue. In that case, have a qualified technician inspect the motor assembly and thermal sensor on the main control PCB.