Hoover not performing

check the inlet hose and maybe even blow it out with a air compressor

That is more than likely the problem, NEVER put wet or even damp filters back into your vac

If there is no suction at all, not even a little bit, then most likely the suction fan is broken. They aren't too complicated to replace if you want to.

Here is a site which will guide you through possible causes that are causing the problem with your vacuum and help you pin point the correct one. Hope this helps. https://www.repairclinic.com/RepairHelp/How-To-Fix-A-Vacuum-Cleaner/113-203--/Hoover-Vacuum-cleaner-won-t-pick-up-no-suction

Check for a filter where the air blows out of the machine. Could be clogged.

If there is no suction, there has to be a blockage somewhere in the dirt path. You should hear the motor working a little harder in this condition. Please check the entire dirt path from floor to exhaust (clean all filters too) to find the obstruction.

Thanks for your question @ FixYa.com

It sounds like the motor that spins the beater brush is burned out,If it is under a yr old it should be covered by the manufacturer warretee. Find a Hoover service center that does warrentee repairs.

There are several filters on bag-less vacuums that need to be cleaned. Dig out your owners manual or open the one below. See section 3 for filters and maintenance. If you are vacuuming a house bigger than about 1500 square feet, you should be cleaning the filters every other use. Personally, after using a bagless for a couple of months, I went back to my bagged vacuum.
http://www.hoover.com/pdfs/manuals/U6630900.pdf

you need to not use this until you get it fixed at a vacuum store.they can probably help you with it.might be there is a short or a little water got on the motor.

absolutely all the air in a vacuum would pass through the filter and if its clogged badly you could loose all your suction and if the belt is more than a year old then replace it even if it isnt broken ( they stretch out over time )