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Re: lack of suction in hose
That popping sound is the bleed valve activating - it indicates that there is a blockage in the machine somewhere, probably in the wand if you're saying that there is no suction in the wand.
- Take the wand off the back of the machine - press the two gray buttons to separate it from the hose - hold the wand in the air and look through it - if you can't see the light coming through the other side there's a blockage in the wand - taka a long object like a meytal hanger and remove the blockage.
If that's not the problem, call the Dyson helpline for further troubleshooting, they know what they're doing.
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I'm sorry to hear you've had difficulty with your DC18. If your machine isn't picking up as well as it should be, there may be a blockage in the machine. If you haven't been able to locate one in the cleaner head or internal hose, I'd encourage you to get in touch with us directly for further assistance.
You can reach us on 1-866-693-9766 (US), or 0800 298 0298 (UK). Please have the machine to hand when you call so one of our advisors can run through some checks over the phone with you.
I see that your Vacuum is having issues with it suction, you mentioned that you took it a part to clean it, see steps below.
Check if everything is inserted properly and is in place.
make sure the the Vacuum airflow does not have anywhere else to come out from, cause if there is, the vacuum suction will really not be really getting enough suction to be able to get dirt Off the floor.
Make sure the bag is correctly placed in the Vacuum and is tucked in properly for proper suction.
The hose should be twisted to be locked into Place, either clock wise or counter clockwise which ever makes it lock to the hose socket.
Also check the agitator shield beneath making sure that the Belt is not pinched in or squished by the Agitator and the Agitator shield, this can also cause lack of suction for the Vacuum.
I hope that this will be of help regarding your query.
At the top of your wand, do you have a plastic swivel that cover a hole in the wand? This is for when you are cleaning curtains, and if that is open, or cracked you will loose suction there... also check your hose for cracks, or breaks. If it were in the shop I would put a gauge on it... normal suction is about 80-95 inches of water lift at the end of the hose. Once you have check each section of the hose, and wand, check the housing for cracks, a missing gasket (Very Good Reason For Lack Of Suction) As to your Filter, how long have you used that one filter, you can clean them for a while, but once a paper filter gets full of FINE dust you won't get it all out, you will have to replace the filter itself at that point. I hope this was helpful.
I had this problem once too. When the hose is inserted into the vacuum, the floor unit (where the spinning brushes are) becomes the head of the vacuum. In other words, the suction goes through the floor part and then up through the hose and into the vacuum. If the suction is good when the hose is out, the the problem is blockage at the bottom piece. Take the cover off of the rollers (it is one screw then it pops right off) and see if there is a bunch of lint/hair/gunk blocking the suction hole. You could also take the hose part out of the vacuum and look down the empty shaft with a flashlight and see if you see anything there. Hope this helps!