Vacuum makes a high-pitched whistling noise during use

Safety first: Switch OFF and remove the battery before checking seals.

• 1. Reseat dust container: Remove and reinstall the bin, ensuring it clicks firmly into place.
• 2. Inspect gaskets: Check the rubber seals around the dust container and filter housing for tears, deformation, or dirt. Clean with a dry cloth.
• 3. Check joints: Assemble the vacuum piece by piece while running (with battery inserted, keeping fingers away from moving parts) to locate the source of the whistle. Gently press on joints to see if the sound changes.
• 4. Replace damaged parts: If a gasket is torn or a plastic part is cracked, replace the affected component with a genuine Miele part.