Removable Tube not connecting

Check the hose connection for leaks and filters. Here is a tutorial video on the DC25 possible loss of suction -
How to fix loss of suction in Dyson DC25 vacuum cleaner

THE INTAKE TUBE IS BLOCK PLUGGED...! FROM BOTTOM OF VAC SCREWS REMOVE WHERE TUBE IS AND CLEAR OUT BLOCKAGE REVERSE PROCEDURE FOR RUN.

Good morning,

If you've checked both the bag and the filter, the next step would to check for any clogs.

I will detail what you will need to do below, or you can always reference your Owner's Guide (check: How to Check and Clear Hose Blockages)
http://www.eureka.com/service/manuals/77418_r2.pdf

Step 1: Remove hose from hose retainer on the base and check suction at end of hose - if little or no suction, check dust cup. Empty if needed. If no improvement, proceed to step 2.
(Make sure you turn off the switch and unplug the unit before proceeding to step 2)

Step 2: Remove electrical cord from cord hooks. Disconnect the clear tube by unscrewing the 2 screws, then lift away from cleaner. Check for any obstructions that may be in the tube or hose. Any obstructions can be removed by using a blunt instrument to clear the tube or hose (I will sometimes you a bent hanger or a retractable pointer). Flexing the hose may help loosen the blockage. After clearing blockage, reverse above steps to reassemble unit.

I hope this helps. If so, please give this solution a thumbs up!
Have a good day
~PCF

Check for blockage.

Most likely place is in the tube leading up from behind the beater bar. While unplugged, remove beater bar & belt & check.

If you have a strong shop vac, remove beater bar, belt, and bag, applying suction to the tube in back of the beater bar will many times dislodge the clog with little effort, sometimes though it will take some fishing around with a stiff piece of coathanger wire or similar.

Normally when you can apply suction with the shop vac to the tube in back of the beater bar & feel suction at the tube were the bag connects, you know you've got it all and you should be unclogged. Put it back together and you should be ready to roll.

Things to check.The fan scroll is what the handle tube goes into.Remove the tube and inspect the scroll for a clogg.Also inspect it for a crack,you may want to remove the bottom plate to do so.Look in the roller brush area for the intake hole into the fan it could be clogged there.If the bag inflates you do not have a clogg if it dosent you have a blockage somewhere.if you havent checked remove the bag it can also clogg up right where it attaches to the tube.It sounds from your description that you have a blockage. www.sewvac.com

This is an indication that there's a blockage in the airflow system. Check the hose, power head tube, and behind tank filter for clogs. For the hose and PN, you can detach the hose and drop a coin in one end. If it doesn't roll out, there's a blockage and it needs cleared. Try using a broom stick to push the clog out from the tank end. Or place PN end of hose to the tank in port and turn on vacuum. This should clear the hose.
For the PN, drop a coin into the hose connection. If it doesn't drop through, there's a clog in the PN tube, probably at either the elbow or behind the brush. You may be able to clear it using longnose pliers to pull needles out from the hose end, or try pushing out with a long, dull object. A wooden spoon or spatula handle will work fine.

There must be a blockage in the machine base. Unplug the machine lie it completely flat and turn it over, open the orange or grey trap door and clear the blockage. Also inspect the area where the hose/tube connects to the machine.

I cut a strip of window screen about 1 inch wide and 12 inches long and slid it up the tube from the back of the vacuum. The screen edges grabbed the gunk and as I pulled the screen strip out from the tube the gunk came with it, clearing the blockage.

My Dyson DC14 had no suction...see if this works...turn the Dyson upside down...there is a length of hose that connects the bottom of the vacuum to the top, careful remove one end of the hose and check for debris...mine was clogged. Removed the clog and voila...it works. Thanks for the above info on checking the hose for cracks.

check the small hose that is under the machine ( it connects to where the brush roller is ) also you can remove a u shaped tube near the bottom of the machine and also another on the right side of the machine near the bottom as well