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When switch to carpet, the difference is that the brush roller turns. When it is on hard floors setting it doesn't. Remove the base plate, remove the brush and the belt. There is likely something wrapped around the drive spindle or clutch.
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).
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.
Vacuum Cleaners require AIr-Flow. Your machine is not getting any air-flow. The noise you hear is a valve opening up to prevent your machine from overheating and burning out the motor. You probably have an obstruction somewhere in the machine. Dysons are kind of known for that in the vacuum cleaner world. Check all air channels and clean them out. If that fixes the problem you still might have issues that caused it to clog up.
I posted the part second because it takes 24 hours to complete it. Be sure you wash your Washable Pre-filter. It needs to dry for 24 hours. Never put it back in the machine wet.
Once it is completely dry reinstall the pre-filter and your machine should be back to normal operating functions.
Here are some things you can check.First you need to see if the problem is with the suction or agitation.If the suction on the hose for using the attachments is low you either need new filters a new cyclone(they are not cleanable) or it is clogged.To check for a clogg remove the cyclone and turn on the vacuum cleaner.you can put your hand over the suction side of the handle tub and feel if it has suction there.Reinstall the cyclone and again check the hose.If it is the same you don't likley have a suction problem you have an agitation problem.The 2 belts on the DC07 are part of the clutch and when they are strectched to a certain point (3-5years) the clutch needs to be replaced.you can check the clutch by turning on the vacuum cleaner and applying slight pressure downward on the front of the vacuum head.If the vacuum makes a loud ratcheting noise or you can stop the brush from turning the problem is most likely the clutch.One last thing is to make sure the bottom plate is on correctly I often see a misaligned bottom plate and the brush dosen't hit the carpet so it dosen't pick up. www.sewvac.com
This is a telltale sign that your vacuum cleaner is clogged. When the motor makes the higher pitched louder noise, your motor is not able to pull air through it, and has to strain harder because it's not able to breath.
Because you have already narrowed it down, that the noise only happens when you put the wand back into the vacuum, this means that you clog is definitely in the bottom section of the vacuum cleaner. Most clogs on upright vacuum cleaner occur right at the suction port behind the roller brushes on the bottom of the machine. Turn the vacuum upside down so that the brushes are facing upwards. Unscrew the bottom plate of the machine so that you may access the roller brush and belt. Look behind the brush roller for the opening of the vacuum where the suction port it. Look inside here and see if you can visibly see anything lodged inside. Sometimes just pushing a long screw driver into this hole can dislodge the obstruction.
If you aren't able to see anything in this port, and the screw driver doesn't dislodge it, look inside the small section of how that the wand connects into, and try pushing your screw driver down this hose to see if you can dislodge it from this part.
Sometimes a metal hanger can also effectively unclog hoses on vacuum cleaners, but just be careful that the hanger doesn't tear the lower hose section while you're pushing it through.
Also if you have another vacuum in the home, using the hose from the other vacuum and putting it inside the lower hose, or the suction port behind the brushes while you're pushing with the screw driver will also many times dislodge the obstruction easier.
Please let me know if this was able to unclog the vacuum cleaner, and I'd be more then happy to try and do some more advanced diagnosing with you for your vacuum cleaner.
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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
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