Vacuum runs but makes a loud high-pitched whistling noise

Safety first: Turn off the vacuum and remove the battery.

Locate the leak:

• Assemble the vacuum and run it briefly while listening closely (keep hair and clothing away from moving parts). Note where the whistling is loudest.
• Inspect the dust bin rim and the rubber gasket that seals it to the main body. Look for tears, flattening, or missing sections.
• Check the dust bin and cyclone housing for hairline cracks by holding them up to a bright light.
• Ensure the bin is fully latched and the cyclone is seated correctly.
• If the gasket is damaged or the bin is cracked, replace the dust bin assembly or gasket as a unit.

Warning: Do not use tape as a permanent repair on high-suction areas; it can detach and be sucked into the motor.