Polaris 380 does not run correctly

Polaris 380 does not run correctly

With the booster pump on and (backup valve & Polaris disconnected from hose), I get low water pressure from Polaris hose. Equal to if you just turned on your outdoor water hose to low.

Should I higher water pressure than this?

I haven't used my Polaris for a few years because I switched to a non-pump driven cleaner. Having said that, When I was using it, I always would watch the action of the tail. If it wasn't sweeping back and forth frequently, I knew something was up. Once in a while, that something was some debris that would get through the filters into the pump. The good news is that's the least likely. Most of the time though, it was a hose connection that came loose. Check those first. That includes the connections inside of it.