The answer to 'hydro jetting frozen' is that hydro jetting is generally not recommended for frozen pipes, as it can actually cause further damage. Frozen pipes require a different approach to safely thaw and clear the blockage.
Common causes of frozen pipes include extreme cold temperatures, inadequate insulation, and poor winterization. Symptoms include reduced or no water flow, burst or cracked pipes, and potentially water damage. The best solution is to call a professional plumber, as safely thawing frozen pipes requires specialized equipment and techniques to avoid making the problem worse.