I have a V11 which has started pulsing on the med and eco settings, which I understand is normally a sign of restricted airflow/blockage. (No pulsing on the boost setting).
I stripped it down completely, cleaned everything, re-assembled, fitted a new filter, and still it pulses. I am absolutely certain there is no blockage.
The cyclone motor even pulses when its completely stripped down (ie only the electric motor, plus filter, plus battery). I suspect a faulty sensor......
Any ideas anyone?