When I turn on my Dyson is seems okay for about 5 seconds then it starts making a loud blowing noise. The blowing is coming from the small vent on top of the canister (underneath the handle) and also from around the base of the canister (where it attaches to the vacuum), both areas are blowing hot air. It still picks up some things, but there is a great loss of suction.
I've cleaned the filters and checked for blockages.
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The issue you're describing sounds unusual. If you think the noise coming from the cleaner head and brush bar is excessively loud, you might like to follow the steps shown in the video below to make sure nothing is jamming or obstructing the brush bar:
If you're confident there are no obstructions, but your machine is still sounding much louder than it should be, please do not continue to use your machine. At this point, it would be best to contact the Dyson Customer Helpline directly so we can provide further assistance. If a repair or a replacement part is needed, we can also confirm if this is covered under your Dyson warranty.
When you have your DC50 to hand, please give our experts a call on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).
Like most Dyson vacuums, DC17 includes a suction relief valve. This allows extra airflow into the vacuum to protect the motor if the machine is used when blocked. If you've already washed the pre-motor filter and checked all the ducts for blockages, it's possible there's an issue with your machine's cyclone pack which has caused it to block.
We'd appreciate the opportunity to help you check for this - please do not continue to use your machine in the meantime as this may cause damage. When you have your DC17 easily to hand, please give the Dyson Customer Helpline a call on 1-866-693-9766 (US), or 1-877-397-6622 (CA).
We would strongly advise against dismantling your machine any further than is shown in the User guide - this can void your free Dyson guarantee. If your DC41 doesn't seem to be working correctly and is making an unusual noise we should be able to help, and at this point I would encourage you to contact us directly to discuss your options.
At your earliest convenience, please contact the Dyson Customer Helpline on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).
Is it when you go from carpet to floor or floor to carpet? It will make a loud noise detecting a possible suction issue. I've also had loud noises and turned over the vacuum and where the brush is, traps hair, thread, rubber bands, etc. Just take a scissor and cut it all out. Don't cut the bristles. Roll the brush as you cut and pull all the stuff wrapped around the brush. Once it is free, try it again.
You have not stated which model vacuum you have. Bipass vacuum have a bipass compartment which is under drive unit. Make sure there are no cracks around housing as this is where you vacuume is created. In order to have vacuum you must have airflow, in assences suction. No air flow, no suction. If the airflow is deverted somehow suction will stop. Your filter, your bag are all sources of air flow. Clog either and you lose suction. Start with loss of air, being cracks in housing,bag or filter
very simple fix. took me a good hour to figure this out but... first take off your brushhead. via popping the clip so all u have is the circle showing then turn on the vacum using the hose. put the hose over the hole where the brush head goes.. and give it a shake etc to losen up whatever it is u got stuck up in that hose. mine was xmas tree/cat hair mix. which is the death of any vacum lol.. but that noise on the top of the can is cause by suction loss. just use the hose to **** out whatever u got jammed in there and use your finger if u need too. and then no more canister noise.