F
faithhealer
If the tiles are still stuck at least you the wall is still good. When you look through the gap between the tile can you see adhesive or wall. I ask this because if the wall tiles have been 'dot and dbbed' as opposed to full coverage, this means that any water can run between the 'dot and dab' through to the floor. If you can find where your water comes from for your shower and look for any type of isolation valves. I wouldn't turn your mains off unless you have someone to help you paul. If the water does not appear when the water is just falling into the tray I would say it is just a grout failure some where therefore leave the mixer on.