Vacuum makes a loud high-pitched whine during use, louder than normal.

Safety: Remove the battery before inspecting seals and housings.

• Check for air leaks: Run the vacuum briefly and feel around the bin and cyclone joints for escaping air (do this carefully and briefly with battery installed, then remove battery to fix).
• Inspect seals: Look for flattened or torn rubber seals on the bin and cyclone. Replace damaged seals or bin assembly.
• Check for cracks: Examine the cyclone and bin for hairline cracks that could cause whistling; replace if found.
• Motor noise: If the whine comes from the motor area and is accompanied by burning smell or vibration, the motor bearings may be failing and the motor assembly should be replaced.