The answer to 'how to unclog pressure regulator' is to first turn off the water supply to the regulator. Then, unscrew the cap or cover on the regulator to access the internal components. Use a small wire or tool to carefully remove any debris or buildup that may be clogging the regulator. Once cleared, reassemble the regulator and turn the water supply back on to check for proper function.
It's important to take safety precautions when working with plumbing components, such as shutting off the water supply and wearing protective gloves. Unclogging a pressure regulator is a relatively simple DIY task, but if you're uncomfortable or the issue persists, it's best to call in a professional plumber.