The answer to 'pressure regulator overflowing' is that the pressure regulator is likely malfunctioning and needs to be repaired or replaced. A pressure regulator is a device that controls the water pressure entering your home, and when it's not working properly, it can cause the regulator to overflow and leak water.
Some common causes of a pressure regulator overflowing include a stuck or faulty diaphragm, a clogged filter, or mineral buildup inside the regulator. Symptoms may include low water pressure, water leaks, or the regulator continuously dripping or overflowing. To fix the issue, you may need to clean or replace the pressure regulator, which is typically a job best left to a professional plumber.