Vacuum produces an unusual high-pitched whistle during use.

Safety first: Turn off and remove the battery before checking for leaks.

• Step 1 – Check connections: Ensure all accessories, the tube, and the dust cup are fully clicked into place.
• Step 2 – Inspect seals: Examine rubber seals at each joint for damage or misalignment.
• Step 3 – Check tube and nozzle: Look for small objects lodged in the tube or nozzle that could cause whistling.
• Step 4 – Replace damaged parts: Replace any cracked extension tube or worn seals to eliminate the whistle.