When I pull out the diverter, I have no running water only a little leak. However, 5 minutes before this happened, my son had taken a shower and water. Please help.

Hello steve, you may need to remove the showerhead and check it for debre that may be plugging it. If the deverter is working properly then more than likely its going to be the shower head. Goodluck ---zeke----

Yep. Truck41 said it: clean shower head first. Also, while you have your shower head off, run water through the shower arm. See if you get proper flow.