Safety first: Turn off and remove the battery before inspecting seals.

Check bin seal: Inspect the rubber gasket around the dust bin opening. If it is torn, flattened, or missing, replace the bin or gasket.
Inspect connections: Ensure the wand and attachments are fully inserted and locked.
Look for small blockages: Shine a light through the wand and cyclone inlet to find small objects lodged in corners and remove them.
Check cyclone housing: Look for hairline cracks. If present, replace the cyclone/dust bin assembly.

Vacuum produces high-pitched whistling noise

Possible Causes