Vacuum makes a high-pitched whistling noise during use

Safety: Remove the battery before inspection.

• Localize the sound: Run the vacuum briefly and listen around the bin, filter cover, and wand joints to find the loudest point.
• Inspect seals: Remove the bin and filters. Check all rubber gaskets for tears, deformation, or missing sections.
• Check plastic parts: Look for hairline cracks in the bin, wand, and nozzle neck.
• Reseat components: Reinstall the bin and filter cover firmly until they click.
• Replace damaged parts: If a gasket or plastic housing is cracked, replace the affected component to restore proper sealing.