No water comes out of my shower,hot or cold water. The water pressure slowly got worse and worse. Now no water at all. I shut the water off and took the single handle off, I looked inside the shower wall, there is one big hole in the center and two smaller holes on each side. I looked at the handle parts and nothing seems to be clogged.could the two small holes in the shower be clogged? And if it is, how do I unclog it?

Your single handled shower valve has a cartridge. Did you shut the water off, remoive the cartridge and check and clean the inlet ports? After did you turn the water back on for a minute to flush out the supplies? Regards, Tom

Did you check the shower head for debris? Remove the shower head and turn water on to check flow.