Cordless vacuum makes a loud high-pitched whistling noise during operation.

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

• Localize the noise: Run the vacuum briefly and listen around the dust bin, filter cover, and wand joints to identify where the whistling is loudest. Then power off and remove the battery.
• Inspect for cracks: Examine the dust bin and main body for hairline cracks. Replace any cracked plastic parts.
• Check seals and covers: Ensure the filter cover is fully latched and that all rubber seals are intact and seated correctly.
• Reassemble carefully: Refit the cyclone and bin, making sure all locking tabs engage properly.

When to call a technician: Persistent whistling with visible cracks in the housing may require replacement of the dust bin or main body shell by an ETA service center.