I just purchase a new back up valve for my polaris 380, it worked at first, but now the back valve continuous water flow through the valve. The same issue was happening with my old valve so I replaced the valve. Now I am still having the same problem.There are new belts and the wheels are Turing but 22 rpm. I am going to rebuild the Polaris, but wanted to fix this problem first. Any suggestions. Have a hard time believing its the valve since it happen on both the old and new valve. All skimmer basket and filters are clean.