Why has my hoover lost all suction from the base when pedal is pressed and handle tilted back. i can only hose with attachments in upright position

SOURCE: No suction in upright position

Check the adapters at the bottom. They're supposed to move cleanly when you lower the handle. It's pretty obvious if there's an air gap when you lower the handle, and you should hear the suction in the air gap.

And...call Dyson...their support is great!

SOURCE: No vacuum suction during normal floor cleaning operation

That door is called a valve door, and it may have broken, part #38718013. Or the valve arm, rear broke, part number 38719048. The spring part # is 38358001. Usually it is the valve arm that breaks. You would have to take the top cover off, then you can see the parts.

SOURCE: Dyson Dc07

I had the same issue and solved it easily.My experience is the same as the March 6th response/ When you push your foot onto the base and then recline the handle, use your toe to gently push the very front of the base down closer to the carpet. This creates a much stronger seal and suction and picks up every bit of dirt easily. If i do not do this extra step the suction is much much less. I tried an experiment with sand that I poured onto my carpet. Initially, I went over the sand 4 times and the dyson 07 would only pick up 50 percent of the sand. I then poured more sand onto the carpet, and this time pushed the front lip down so it was contacting the carpet. This time only two passes were needed to completely **** up all the sand. Not sure why this is not in the manual but it really works. Good Luck!

SOURCE: Dyson Animal hose collapses when using attachment hose

You have a clog in either your hose or your wand. You need to take off the wand and hose and inspect them.

SOURCE: handle wont go to upright position

The red pedal has slipped out of position. On both ends of the red pedal you'll see metal rods (the axel of the pedal). On one side you'll see the metal rod sits into a long groove, on the other side you'll see the metal rod sits into a round hole. They both have to be in the long grooves so you have to reposition the rod that's into the round hole by pulling it out and sliding it back into the long groove above the round hole. You'll now be able to bring the handle up and lock the machine back into the upright position.