Hi i have a dyson dc33 and seems to be losing a lot of suction ive replaced the filters there sounds like air leaking around the base of the cannister thanks Dave

SOURCE: Loss of suction, loud blowing noise

Hi.

Try cleaning out the vortex this will sort out poor suction.

http://dysonmanuals.llc.nu/

SOURCE: My DC05 Dyson suction has

My Dyson had exactly the same problem. I found the problem was caused by a blockage in the hose. Take the hose out where it joins the cleaner (it will come out if you pull it downwards gently) and take the hose out of the handle by squeezing the yellow buttons on either side. I pushed a rubber alkathene pipe down and found a piece of plastic was blocking it even though at first I was sure it wasn't blocked.

SOURCE: Dyson has lost suction and loud noise from base(?),

I had the same problem, from right out of the box. Now that I just threw mine out, I see this site that indicates there's a fix for it:
http://ths.gardenweb.com/forums/load/cleaning/msg0415060828462.html

And search for other sites isung "dyson grinding" or similar.

Since I was an early adopter (had one as soon as they came stateside), I did not have the benefit of countless others having the same problem, I just attributed it to a junky design, since so much else about this vacuum was poorly designed, like the seals, hoses, etc.

Give them a call, and good luck! I might rescue mine from the heap and do the same.

SOURCE: how to change upper filters?

Open the vac as though to change the cone and remove the plastic inner cone with the slotted screw at the bottom.. Underneath you will find a 5" disk , likely coated with fine dust.
That is the one which needs to be changed. Around that disc will be three more screws holding the upper housing onto the vac. These ones are accessible from inside, if changing the motor.
Below the handle of the vac there is a serial number ring and three screws in an offset triangle. If you remove these and the rubber cover for the toe switch, the vac housing will come off. This will reveal the `foam or cotton ``muffler``. You can replace it or wash and dry it if foam. It acts as a muffler more than a a filter....

SOURCE: my dyson slim dc18 has suction in hose attachment

Hi its Darran at Dyson.

It would be worth checking that the brush bar is turning when the machine is in the vacuuming position. If it is not turning, please press the re-set switch located on the cleanerhead.

If this starts the brush bar turning but does not solve the problem, please check the cleanerhead for blockages and remobve any threads or hair trapped around the brush bar.

Shoudl you need any further help or advice, please contact our Helpline on 1866MYDYSON.

Kind regards
Darran
Dyson Customer Service