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.
Try to clean the blower section of the fan.
Sometimes simply powering off holding the base with one hand then manually oscillating the unit a fraction of the way will stop the noise.
For the oscillating squeak like noise.
Pitch happened in just 4 5 months of purchase.
Dyson fans are notorious for getting clogged with dust at the bottom section and the turbine blades.
Was hopeful the newest model would have corrected the problem i was wrong.
Hoping it never comes back now.
Dp04 was out of warranty so i sold it to a friend cheap.
Dyson am07 bladeless fan disassembly for cleaning and maintenance step 1.
Gently pry the snap lock nearest to the screw and.
Has this resolved the problem.
Refit the loop amplifier turning clockwise ensuring that there are no gaps.
It s way more common than it should be.
Can confirm dp04 and tp06 both had high pitch noise.
Tp06 was replaced by dyson immediately.
Unscrew the single t8 torx screw.