Polaris 280 that used to work does not move any more. We moved into this house last winter and Polaris was hooked up and working. I took it out of the pool in January and stored it. After connecting it back again few weeks ago the thing does not want to move at all. Took it to the local Leslie's swimming pool store for the inspection and the only thing they found to be an issue was the pressure relief valve that's gone bad. They've inspected inside of the cleaner, wheels. Replaced pressure relief valve but Polaris still does not move. It just sits on the bottom of the pool. Booster pump is working fine as far as I can tell and it's pumping water, even though I did notice that there's no big difference in the strength of the stream of water coming out of that line whether booster pump is off or on. The stream of water appears to be the same, I would think it would be somewhat stronger with booster pump running. Anyway, didn't think that would be cause of Polaris not moving at all as it appears to be enough water. Couple other things I've noticed: small water leaks at both of the hose swivels and constant stream of water out of the backup valve -it never stops while booster pump is running. Could swivels or backup valve be an issue? What else to check for? I'm new to this cleaner so any insight you may provide would be greatly appreciated.