Vacuum has an unpleasant musty or sour odor when running, even after emptying the bin.

Safety: Remove the battery before cleaning. Do not immerse electrical components in water.

• 1. Deep clean bin and cyclone: Remove the bin and cyclone. If the manual allows, wash them with mild detergent and warm water. Rinse thoroughly and dry completely.
• 2. Replace or wash filters: Remove pre-motor and HEPA filters. If washable, rinse with lukewarm water and allow to dry for at least 24 hours. If not washable or heavily soiled, replace with new Siemens filters.
• 3. Check for moisture: Ensure all parts are completely dry before reassembly to prevent mold growth.
• 4. Avoid vacuuming liquids: Siemens cordless vacuums are generally designed for dry use only. Do not pick up wet debris.
• 5. Regular maintenance: Empty the bin after each use and clean filters regularly to prevent odors from developing.

Persistent odor after thorough cleaning may indicate hidden contamination; replacing the bin and filters usually resolves it.