Use safe heating methods like an electric heating pad, a hair dryer, or towels soaked in hot water to gently warm the frozen section.
A portable space heater can be used to warm up areas under the house, but ensure it’s away from flammable materials and never leave it unattended.
Continue applying heat until full water pressure is restored. Wrapping a towel around the pipe afterward can help retain warmth.
If you can’t locate or reach the frozen area, or if your efforts don’t thaw the pipe, it’s time to call a licensed plumber.
Never use open flame devices like blowtorches for thawing pipes, as they pose a significant fire hazard.