Dyson fans are notorious for getting clogged with dust at the bottom section and the turbine blades.
Dyson fan noise problem.
Brush the outside of your machine with a soft brush to remove any debris from the shroud.
Hold a newspaper approximately 2 meters 6 6 away from the product with the airflow control dial turned to maximum.
Unplug your dyson personal purifying fan from the mains electricity supply before cleaning your machine.
Get expert help troubleshooting from dyson to get the most out of your machine.
There s a problem with the oscillation.
This may be causing the motor to work extra hard resulting in the noise i have posted an article on how to do this at the following link.
Look for blockages in the air inlet holes on the shroud and the ball.