Cordless vacuum makes a loud high-pitched whine during use

Safety first: Turn OFF the vacuum and remove the battery pack before inspection.

• Check for air leaks: Ensure the dust cup is fully seated and latched. Inspect the rubber seal around the dust cup and replace if torn or deformed.
• Inspect housing: Look for cracks or gaps in the main body near the motor vents. Small cracks can cause whistling; large cracks may require housing replacement.
• Clear airflow: Clean filters and check for blockages in the wand and nozzle that can create high-velocity whistling.
• Motor bearings: If the whine comes directly from the motor area and persists after cleaning, the motor bearings may be failing. Continued use can lead to complete motor failure; have the motor assembly replaced.