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.
Dyson fan noise fix.
Unscrew the single t8 torx screw.
It s way more common than it should be.
Try to clean the blower section of the fan.
Was hopeful the newest model would have corrected the problem i was wrong.
Sometimes simply powering off holding the base with one hand then manually oscillating the unit a fraction of the way will stop the noise.
If the noise still occurs this suggests it is an issue with the motor.
Dp04 was out of warranty so i sold it to a friend cheap.
Dyson fans are notorious for getting clogged with dust at the bottom section and the turbine blades.
Refit the loop amplifier turning clockwise ensuring that there are no gaps.
Hoping it never comes back now.
Remove the coanda effect ring by turning it counter clockwise holding the base securely and.
For the oscillating squeak like noise.
Get expert help troubleshooting from dyson to get the most out of your machine.
Can confirm dp04 and tp06 both had high pitch noise.
Gently pry the snap lock nearest to the screw and.
Has this resolved the problem.