le fuzzies reliably when I push it along. And, the suction is too hard I think because it used to push easily and now I have to push really hard, even on flat carpet.
Dyson DCO7 Animal Bagless Upright Cyclonic Vacuum

How to Identify and Fix Common Vacuum Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced Vacuum Technicians :

The air velocity is dependent on the air volume that the vacuum cleaner is able to suck and on the diameter of the suction hose. The greater air volume, which the vacuum cleaner is able suck, the greater the air velocity becomes.
The most common cause of loss of suction is that the filters have become blocked. They may require cleaning or replacing. Another cause could be that the vacuum cleaner hose is blocked.
One of the easiest ways to increase vacuum cleaner suction is to empty the dust bag or container. Dust containers need to have enough space for airflow, otherwise, they could get clogged and have less suction power. Regularly check your dust compartment and empty or change it when it`s already 70-80% full.
So, the usual areas that cause suction loss include the wrong height setting, stuck rollers, a faulty gasket, a broken vacuum belt, a filled bag, or a clogged hose.
Check for a plugged hose:

Plugged vacuum hoses are sometimes the reason for a loss in suction. Hoses can get clogged with hair, dust bunnies, string, or anything else that can`t pass through the other end of the hose. Airways inside the machine should be looked at as well. Wherever there is an air passage, check it.

Vacuum Suction

Suction is ultimately what gives a given volume of air its speed or velocity by the vacuum motor. The more suction you have, the quicker a given volume of air is moved.

Often when your machine is not picking up it is due to loss of suction. If your vacuum cleaner turns on but won`t pick up on carpet or bare floors, something is impeding suction. You may need to change the vacuum bag, unclog the hose, replace/clean the filters, replace the hose, change the belt, or repair the motor.
Pressure drop is the loss of line pressure caused by frictional resistance in the flow path. Everything causes some degree of frictional resistance on the fluid flowing, such as a valve, fittings and tubing, and this results in the loss of pressure.
Air watts are a European test standard (IEC60312) for vacuums. An upright vacuum cleaner should be around 100 air watts and a cylinder vacuum cleaner needs to be about 220 air watts.
Overcharging leads to overfeeding the evaporator with refrigerant, which leads to higher suction pressure. Another possibility is having oversized EXV causes an overfeed to the evaporate, which increases your suction pressure.
A little bit of water can do wonders for boosting a suction cup`s grip. Using warm water, rinse the whole cup so it softens it up. Shake the drops of water off the cup quickly and then put it up on the wall.
The two main indicators to determine vacuum power performance are water lift and airflow. The water lift is measured in mmH2O, mbar or kPa. It represents the suction force and is the reference parameter for vacuuming liquids and heavy materials. The airflow is measured in m3/h or in l/s.
Rough vacuum: 760 to 25 Torr. Medium vacuum: 25 to 1×103 Torr. High vacuum: 1×103 to 1×109 Torr. Ultra-high vacuum: 1×109 to 1×1012 torr. Extremely high vacuum: Less than 1×1012 Torr.
A higher breast pump suction level generally means a more powerful motor.
The Roborock S5 offers 2000Pa of suction power. Pa is short for Pascal Pressure Unit. The higher the number, the higher the suction power. Could you imagine what 2000Pa means? It means that the Roborock S5 has enough suction to pick up AA batteries off your floor.
Max(4000 PA): It can deeply clean the place that needs cleaning, dust cleaning is up 80%, garbage collection is up 30%, and the cleaning times are up to 80 minutes.
If the filter bag or canister is too full, it cannot pick up any additional particles and will simply jam or the motor will overheat and shut down. So, when you suspect your unit is about 75 per cent full, empty it!
Other things equal, lower gas pressure means higher-quality vacuum. For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. But higher-quality vacuums are possible.
The pressure exerted by air per unit area is called as atmospheric pressure. Vacuum means the absence of all matter including air. As there is no air in the vacuum, air pressure will be zero.
Even in a vacuum there remains some pressure… it is simply a pressure at a magnitude below the surrounding atmospheric pressure. Vacuum does not necessarily mean the absence of all pressure; vacuum can be any pressure between 0 PSIA and 14.7 PSIA.
Some people confuse volts with the power rating of a vacuum. Volts is related to the battery being used and does not affect the suction ability of the vacuum.
The suction is 22Kpa which is very powerful, easily to pick up the hair, dust and sand in a short time.
The minimum suction power (12,000 Pa) is engineered for routine cleaning and removing small particles. The 5-layer HEPA filtration system captures up to 99.99% of ultrafine particles, be it pet fur/dander, long human hair, pollen, dust mites and other allergens.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

The suction is good, but it can’t pick up most of the stuff on the floor. The hand held hose works very well, but it doesn’t even pick up little fuzzies reliably when I push it along. And, the suction is too hard I think because it used to push easily and now I have to push really hard, even on flat carpet.
ANSWER : Check entire length of hose, including the piece in the power head, for clogs. Simply drop a marble in one end and allow it to roll out the other. If it doesn’t, then the hose is clogged somewhere.

Suction only works using the hand held mode, there is no suction when try to use on carpet mode,
ANSWER : There must be a clog in either the hose, dirt inland by the brush roll, or bad filters. If you have suction at the end of the hose, then look lower all the way to the brush roll.

My dyson seems to have lost its suction therefore is not picking up anything yet i have found that when my dyson is standing upright it has a little more suction but nothing like how it use to work. This has only happend in the last 2 weeks. I sanded a floor & though the sander picked up majority of the dust i did use the dyson to pick up the excess and it is since then that my dyson has not been working to its full potential.
ANSWER : Hi there,
.
.Sorry to hear you’re having a problem with your DC07. You should be able to resolve the issue by following these simple steps: http://www.dyson.co.uk/support/help.asp?article=1940&product=DC07-SY
.
.If you’re still experiencing difficulties, please get in touch with us, free, on 08002980298 (UK), or 1866MYDYSON (US), so we can run through some checks over the phone.
.
.Kind regards,
.
.Jack
.Dyson Customer Service

I have a Bissel 9300-C 0714 BC Carpet Shampooer. It was working great and all of a sudden it stopped working. It still sucks up dirty water but it does not spray water onto the carpet. I can get it to spray water through the smallest hand attatchment but not through the large hand held piece on the base of the machine. I really hope you can help me, I am a dog groomer and I really need my machine to work properly. I can get it to spray water out of the smallest hand attatchment but
that’s all t
ANSWER : The spray jet has become clogged from the soap…. just clean it out. same thing happened to my attachment.

My Eureka/The Boss doesn’t seem to have the suction power it had. However, when I place my hand under the hose, it has good suction, then when I try to pull in a small particle, it doesn’t, unless I have the hose nozzle completely over the particle. The vac is 10 yrs. old. I cleaned everything. Someone said the belt. Would the belt matter if the hose doesn’t **** well? It is just old and worn out? It did shut off recently do to overheating. Help. Thanks. Lorraine
ANSWER : Doesn’t “The Boss” Vacuum have a filter? Perhaps your filter is clogged and not allowing it to work properly.

Poor Suction Heya! So I just picked up a used Dyson, but when I vacuum with it, the suction is pretty weak and it spits all kinds of stuff out the back and into my feet. When I pull the hose I have good suction, but in regular mode it hardly picks up anything. The brushes are spinning, and it eventually will clean an area if I go over it again and again. Maybe a clog somewhere? Please tell me that Dysons have better suction than my $50 Dirt Devil! Thanks!
ANSWER : I recently bought a second hand Dyson DC07. Its suction was poor. I removed all the un-clipable pipe bits and to remove any blockage but it all looked clear. The Final Sponge and hepper filter did have a lot of dust in it and the rotating brush was full of hair but nothing bad.
.
.I eventual gave in to curiosity and removed the three screws in the top or the yellow removable dust collection tube and cyclone bit to see what was in there. The mechanism to release the flap at the bottom of the collection tube does not allow you to remove the lid completely but it does open far enough to get inside. I found the whole top section of the yellow plastic bit blocked by a big plug of compacted dust and a champagne cork. If you are willing to take the risk and have a torx 15 screwdriver handy it that part may be blocked. It did get a bit messy.
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.If I was going to attempt the same procedure I’d remove the dust collection unit from the vacuum cleaner as I did before, but leave the clear tube attached and the emptying flap firmly closed to reduce the mess from the dust falling out the bottom while cleaning the top part.

Hoover Jet and Wash 1500w S6254 001. Used once with great difficulty as assembly and use instructions are hard to follow.Now will not work as carpet shampooer at all, although assembly is correct as far as I can see and both motor and pump appear to be working and I am using the recommended cleaning fluid.Hoover website is no use at all in solving the problem.No cleaning fluid is being drawn up from the tank in to the cleaning fluid hose.There is suction from the suction hose so the problem appe
ANSWER : I am having the same prob my uncle got me one i cant find the manual anywhere to set it up the prob i have is where does the handle to make the water go out connect tooo ??? on the main pipe that sucks it back up i have tried every which way but not the right way obviously lol as for it not spraying mine did for all of 2 secs but think it was because i got a bit happy with the solution so gunna just try water and if its too hot it stops it spraying properly too !!

Floor attachment does not suction, no clog in the hose, hand held works when dettached from floor attachment
ANSWER : Have you checked the floor head? Use a pipe cleaner or twisted metal to carefully and gently see what’s in there. It sounds like dirt or something has definately sealed up the main suction channel.