Whistle noise from filter

Please read this answer all the way through there is something that may be relevant (strike out 'important') at the end !

Maybe it's this
"clip that holds the filter in place and the locating lug of the access flap to gently rub together as the ball rotates and create a slight clicking noise as the appliance is moved around (though is not routinely noticed due to the motor noise)"
(from Fully Cleaned Serviced Refurbished Dyson DC25 Animal Ball Vacuum Cleaner )
stop press - I just saw this - if you do not have proper Dyson brand HEPA filters - see end of answer - you may get a loud clicking sound....
The manual tells you about removal and cleaning HEPA filter - the All floors version has one as well)
Otherwise I can only refer to Dyson support, there are various ways of contacting them given at the top right of this webpage Support forDC25 Multi Floor
(the user guide manual is downloadable from this webpage)
Sounds to me as if maybe there is an irregularity on the ball that is contacting the body/ball housing every time the ball does round....unfortunately this makes the ball diameter ~8cm which too small.

18.April.2015

Beware Some After Market DC25 Filters Do Not Fit Correctly March 2014

It may be air whistling past the exhaust filter, which may need replaced. Try removing the filter to see if that could be where the noise is coming from.

Hi Cheryl, it's Jack at Dyson.

DC25 has two filters, engineered to last the lifetime of the machine in normal use. One is housed within the cyclone pack, and one within the ball shell. We recommend washing these at least once every 3 months, using cold water without detergent. Allow both filters to dry completely before replacing them - this may take at least 24 hours.

Our video guide below will show you where both filters are located, and how to wash them correctly:


If you're concerned your DC25 isn't picking up as well as it should be, washing both of the filters as shown should definitely help. However if you're still concerned after washing and replacing the filters there may be a blockage somewhere. Our online Support pages should help you locate and remove any obstructions: http://www.dyson.com/support/dc25/dc25-multi-floor/diagnosis-root-menu/dc25filterwashvid/dc25filterwashvid/performance-flo-dc24-suction-check

If you'd prefer to speak to our experts directly for assistance, you can reach us by calling 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).

Hi there, it's Jack at Dyson.

If your DC25's ball won't rotate freely, it's possible the HEPA post-filter housed inside the ball is out of place and jamming the ball shell.

To resolve this, please remove the post-filter door and replace the post-filter, pressing it firmly into position until you hear and feel a click from the red catch. This is shown in our filter wash video guide below:

This should resolve the issue, but if you find that it happens again I'd encourage you to contact us directly so we can provide further assistance. You can reach us by calling 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).

You are hearing the air whistling past the gasket. Touching it may make it come and go. It is a small air leak bypassing the filter. It is more of a nuisance than anything. A bit of fine dust may be getting past the filter too so It's best to try to adjust it so it does not make the noise. If your filter was still wet or is clogged it will cause a restriction which makes it more likely for the air to try to get past the filter because it is having a hard time going through the filter.

Hi Basil,

I am sorry to hear your machine is emitting a high pitched sound. Based on the details you provided the problem may be isolated to the post motor filter, if so a new filter will be needed. We would like to help with this. Please contact our Helpline to speak with an expert:

US - 1-866-693-9766 or UK - 0800 298 0298

Best wishes,

Jessica

if it started after you cleaned the filters, it is because when you smack the filter that is in the ball like they tell you to, it pushes the rubber gasket in so air can sneak past it. take it back out and pull the rubber gasket away from the filter so there is about 1/16-1/8" away all the way around, then put it back in. it will seal it and stop.

My Dyson DC25 keeps blowing off the filter within the ball. It then stops the ball from rotating freely.

if it started after you cleaned the filters, it is because when you smack the filter that is in the ball like they tell you to, it pushes the gasket in so air can sneak past it. take it back out and pull the rubber gasket away from the filter so there is about 1/16-1/8" away all the way around, then put it back in. it will seal it and stop.

Make sure the top (above the cones) and the bottom (ball) filters are clean. The whistling sound is due to the bottom filter either being clogged or poorly seated and the air is escaping around the rubber seal, making the whistling sound.