Hi- A neighbor installed new plumbing for me in a shower stall after I removed the tub. I cannot get the brand new body to control the flow of water. Its a Delta shower unit, and I think that the cartridge is installed correctly. I bought a backup cartridge, but before I go that route wanted to see if anyone had similar experience with a brand new cartridge being bad. Tile is in, so hoping i dont have to rip too much of the wall apart to fix Thanks!