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Is the canister empty? Is the filter bag clogged?
Have you tested it without the sweeper head? ie) just the hose? Is the hose clogged?
If that all checks out, then perhaps you do have something caught in a bend. Check all the outlets for suction to help find the aproximate location of the clog. Then use a plumber snake.
It would be very unusual for the pipes to clog. They have a larger opening than the sweeper heads and the hose. That is, if it can get into the hose, it can get thru the pipes.
Perhaps you can disconnect the pipe from the unit and go from there. I'd think a plumber's snake would work.