The answer to 'pressure regulator not working' is that a faulty or malfunctioning pressure regulator is a common plumbing issue that can cause low water pressure throughout your home. Some common causes include mineral buildup, a worn-out diaphragm, or a faulty spring within the regulator. Symptoms may include fluctuating or inconsistent water pressure, or water pressure that is too high or too low.
In many cases, the pressure regulator can be repaired or replaced as a DIY project. However, if the problem persists or you're unsure of the cause, it's best to call in a professional plumber to diagnose and fix the issue. They can inspect the regulator, identify the root cause, and make the necessary repairs or replacement to restore proper water pressure in your home.