There is no suction whatsoever when the vacuum is in the upright position. When I remove the canister and turn on the machine, there is plenty of suction coming from the right opening (round), but none from the left (rectangular). I'm not sure which is picking up the dirt!
I've tried some of the solutions offered by others, but to no avail. There is definitely no blockage in the hose and the beater bar is clear. I wasn't sure how to remove the air valve.
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Re: no suction in an upright position
If there is vacuum at the point you described, then you need to look down inside where that round port connects to the floor head, all the way out to the beater bar. You may have to take the plate off the bottom to look all the way through to where the round vacuum port connects.
Let me know what you find. But the key to fixing this is to think about the direction of air flow as it travels to the vacuum motor. You've correctly identified one important operational fact (vacuum at the round port). Now we have to find the problem, and you are the eyes and ears of that investigation.
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Your collection canister may not be positioned tight enough in its place ment site. Tip machine back using foot pedal (as if you were going tio start using machine to clean) Insert collection canister (bottom container, then insert top canister with solution. The two canisters must be flush with machine side seams and must sit in position tightly. This is sometimes very tricky and may take a little elbow grease to make it click into place. Hope this helps
On the back of the Hoover is a couple of parts you can remove, one is a u bend which will trap heavier parts which resist the suction so get stuck in the bottom of this, and the other part is usually on the right at the bottom which is an acces point to the very art which you hear click. In the upright position it directs the vacuum suction up the extendable pipe, but when you pull the handle back, it should gently glide from one direction over to direct vacuum suction to the bottom plate. It's tha part which is getting stuck in the handle sucking direction. I'd check to see if it is physically damaged in any way or if something is tapped in it like a coin or something. Good luck
Is there suction at the hose? If not it is either blocked or the suction fan is broken. If there is, then there is a blockage in the pickup section, something is lodged across the channel after the brushes and before the place where the hose plugs in.
I think there is a safety switch to prevent it from running with the canister out so hard to check for suction at the top of the motor/suction fan. Make sure nothing is over that part under the canister too! If you can figure out how to bypass the safety switch (if there is one), you should have good suction where the canister sets on top of the motor base.
I had a different vacuum that did this. I took all manner of things apart looking for blockages and the like .I found that by having the vacuum handle in the full upright position shuts off the suction to this area and doesn't power the brush BY DESIGN. I think this is to get more suction to the hose.
With the DC14 in its upright position, and looking from the back, there is an access hatch just to the right and bottom of the dust canister. Remove this and check for any obstruction. With the hatch still removed, tilt the handle back (as if vacuuming a floor), and you should spot that the mechanism in to which the access hatch fits changes over from one hole to another. This is how suction is transfreered from the telescopic arm to the brush bar when the unit is taken out of the upright position.
With the handle tilted back, the hole you can see is one end of a flexible pipe that leads to the brush bar. Check for any blockage and/or foriegn objects. If there is no obvious problem, you'll need to check the other end of the pipe. You can do this by removing the toe plate on the bottom of the brush bar area. The plate is held by 3 or 4 half turn fasterners - a 5 pence piece is ideal for undoing these.
If still no joy, the only other thing it might be is that the brush bar isnt spinning - this isnt actually lack of suction, but without brush rotation any upright hoover is far less effieicnt at picking up bits from the floor. Brushes not spinning on a DC14 is quiet a difficult thing to fix on a DC14 as there are two separate rubber belts, one of which is hidden under a plastic cover. There is also a clutch mechanism between the belts that can cause problems some times.
The first step towards improving the suction is to clean the circular HEPA filter. The filter also houses a circular sponge which should be rinsed and dried before putting it back. Check the HEPA filter to see if it needs replacement -- will look muddy! Another quick check is to remove the HEPA filter, run the vacuum cleaner momentarily in upright position to check if suction is restored at the hose end.
After doing this if suction is still poor or non existent, you should detach the transparent canister - a bit tricky since the release rod for the flap has to be aligned when you want to reassemble the unit. Once the canister is removed, you should check and clean the center tube/shaft for any clogged dust (use a wire coat hanger if needed to pry out the dust). This tube gets clogged if the vacuum cleaner was used to pick up damp/wet spills etc.
check and make sure you have the gasket installed correctly that goes on the center of the cyclone and seals against the canister trap door. If this is backwards, you can lose a lot of suction and it will plug your permanent filter quickly.
There are very few things left to check. First verify that the filter is installed properly, in the dirt cup. second check to make sure the dirt cup lid is on and secure. Did you use water on the round dirt cup filter? if you have you will need to replace it. To verify this remove the round filter and re-install the dirt cup on the vac. do not vacuum the carpet, just turn it on to check for proper suction. and then turn it off.
Your problem has nothing to do with it in the upright position. once turned on you will always have suction, either to the floor or when hose is removed from foot for accessories.