Vacuum makes a high-pitched whistling noise during operation.

Safety first: Turn off the vacuum and remove the battery before inspecting joints and seals.

• Step 1 – Identify noise source: Run the vacuum briefly and listen closely to locate the area of the whistle (dust container, tube joint, nozzle).
• Step 2 – Reseat components: Remove and reinstall the dust container, filters, tube, and nozzle, ensuring each part clicks or locks firmly into place.
• Step 3 – Inspect gaskets: Check the rubber seals around the dust container and filter cover for cuts or flattening. Replace if damaged.
• Step 4 – Check for cracks: Examine the cyclone body and tube for hairline cracks. Even small cracks can cause whistling and suction loss.
• Step 5 – Replace damaged parts: If a crack or badly worn seal is found, replace the affected component with a genuine Severin spare.