My Hoover nanolite bagless vacuum has no suction.

SOURCE: bad suction on bissell powerforce bagless vacuum

I took the bottom apart and it needed a new belt and that was the problem so it's fixed.

SOURCE: Hoover Bagless WindTunnel vacuum cleaner.

very easy. you have clog. take the brush off look where the hole is thats where the clog is. it might be in there you might have to take the housing off of the motor

SOURCE: My hoover U5720950 windtunnel bagless vacuum loses

when you lower the handel it is pinching the vaccume line constricting suction

SOURCE: hoover wind tunnel 2 bagless vacuum not working

Place handle in low position and turn cleaner over so bottom side is up.
Remove the 4 screws in bottom plate and lift off.
Look on the left side of the agitator brush. You should see the belt there. Remove agitator brush roll and used belt.
Discard belt.
With lettering on outside of belt, slide new belt over motor pulley.
Insert agitator though belt and place belt in belt guide on agitator.
Grasp agitator firmly and fit it onto position by first sliding end opposite the belt into the rectangular slot on side of cleaner.Pull other side of agitator into place
Turn agitator making sure belt is not pinched between agitator and agitator shield.
If this does not take care of your problem, then check your filters for dirt and your entire vacuum for blockages. Both filters do come out. If you can't get a new filter right away you can gently clean the paper filter and remove a lot of dirt. (I recommend outside)! The other filter is washable.
Make sure it is well dried before replacing.
Good luck.

SOURCE: Problems with Dyson DC14 Animal Bagless Vacuum

Two possible solutions come to mind. First off, there is a clog in your hose. If you have another vacuum, try using the hose on that one to **** it out.
If that doesn't work, you may need to have the clutch replaced. Check your warranty. The clog wont be covered, but the clutch will be,