No water pressure

Hi
There could be couple of causes to this problem so you need to be more specific, still here are a few things for you to check.
Check the inlet valve and the protective screen that?s inside ? it?s probably clogged, although you can clean the screen its better to replace the valve.
Check your water pump if it working properly.

Remember if you don?t have any(!!) plumbing experience don?t try it yourself and call someone.

Good luck