Need to clear a suction blockage - Vacuums

You sound pretty savvy in your troubleshooting. Take a look at this video. You may have a split in one of your three suction hoses. I tried to find a video for a DC24 but to no avail. These two models are pretty close and this video should help you out.

your hose is blocked get some thing long and thin push it done the hose and try and clear it

I would use a snake for plumbing (sinks) and feed it down the hose to find and clear this blockage if you can remove the hose compressed air may also work.

This sounds like you have a blockage in the vacuum hose.
Clear this blockage and the suction will return.

Check that the bag and filter are clean.
Try it without the hoses and fittings, If there is better suction the hose has a blockage. Reverse the hose and and hold it against the inlet on the machine and let the machine **** though the hose backwards. This sometimes clears a blockage.

If there's no suction, you should first check the User Manual for how to clear blockages (this is the most common suction-loss problem). If you're certain there are no blockages, the machine is still within its warranty period so you should return it to the place where you bought it.

If the floor head has suction and the wand does not, or vice-versa, the white cylinder you are referring to diverts the suction between the floor head and wand. If the flimsy plastic switch used to turn the cylinder is broken, you may need a new under carriage or just set the cylinder to wand or floor manually and use it as a one dimension cleaner. Depending on your ability, perhaps the switch can be purchases and replaced by a DIYer, but the job looks moderately difficult.

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.

The blockage could be in the wand itself or in the entry duct of the machine. Take the wand off, look through it and if you can't see light coming through the other end, there is something stuck in the wand - take it out with a long object like a metal hanger...if the wand is clear, call the Dyson helpline - they will do a thorough blockage troubleshoot over the phone and clear the blockage.

Could be blockage in hose,, try straightening out the hose,,and shove a broom handle down there,,,,if there is no bend!! and clear the blockage out.