Vacuum produces a high‑pitched whistle and suction seems reduced.

Safety first: Remove the battery before checking seals.

• Check all joints: Assemble the vacuum and run it briefly while listening closely around each joint (bin, wand, hose, floor head) to locate the whistle.
• Inspect O‑rings and seals: Remove the dust bin and filters and inspect all rubber seals for cuts or flattening. Replace any damaged seals.
• Check wand and hose: Look for cracks or holes by flexing the hose and shining a light through the wand.
• Secure connections: Ensure all components click firmly into place with no gaps.