Vacuum makes a loud high-pitched whistling noise during use.

Safety first: Turn OFF and remove the battery before inspecting for leaks.

• 1. Listen for source: Run the vacuum briefly and listen near the dust bin, filter cover, and wand joints to locate the whistle (then turn it off).
• 2. Check gaskets: Inspect rubber seals around the dust bin and filter covers. Reseat or replace any that are twisted or torn.
• 3. Tighten covers: Ensure the HEPA filter cover and dust bin latch are fully closed and locked.
• 4. Inspect for cracks: Look for visible cracks in the plastic housing or wand. Replace cracked components.

Result: Eliminating leaks by replacing gaskets or cracked parts will usually stop the whistling and restore suction.