The answer to 'how to fix pressure regulator' is that you can often repair or replace a faulty pressure regulator yourself. A pressure regulator controls the water pressure entering your home, and if it's not working properly, it can lead to high or low water pressure issues.
To fix a pressure regulator, you'll need to turn off the main water supply, remove the regulator, inspect it for any damage or debris, and then either clean or replace it. Make sure to follow the manufacturer's instructions carefully and use the right tools for the job. If you're not comfortable doing this yourself, it's best to call a professional plumber to handle the repair.