The answer to 'why is my pressure regulator clogged' is that a clogged pressure regulator is often caused by sediment or mineral buildup over time. This can restrict the flow of water and reduce the effectiveness of the regulator.
Some common symptoms of a clogged pressure regulator include low water pressure, banging or vibrating pipes, and the regulator not opening or closing properly. To fix a clogged pressure regulator, you may need to clean or replace the internal components. This is a task that can often be done by a handy homeowner, but if you're not comfortable working on plumbing equipment, it's best to call in a professional plumber.