Just scored a curb find of my first Dyson ball vac. After a thorough clean up, the machine emits a very loud howling sound when the post motor filter (in the ball) is installed. I meticulously cleaned and dried both filters, so I'm wondering if this sound is normal. When powering down the single pitch howl actually briefly turns into a two note chorus for a few seconds.
To reiterate, this strange (and un-characteristic) noise does not happen if I remove just the post motor filter. Is this filter damaged? I have no issue replacing it, but not if that awful howling is normal. The sound of the DC25 emits is a pretty close match to my DC14 (non-ball) when the post motor filter is removed from the ball.
Comments and suggestions welcome,
Bill
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