Cordless Vax vacuum makes a loud high-pitched whine or screeching noise during use.

Safety first: Remove the battery before inspecting the unit.

• 1. Check for blockages: Ensure the bin, cyclone, wand, and floorhead are clear to prevent motor overspeed.
• 2. Inspect seals: Check the bin seal and any rubber gaskets for damage or mis-seating that could cause whistling.
• 3. Listen closely: With the vacuum reassembled, briefly run it and localise the noise (motor body vs. floorhead).

If the noise clearly comes from the motor housing and persists after clearing blockages, the motor bearings or fan are likely failing. Continued use can lead to complete motor failure; the motor assembly should be replaced by a technician.