If you cannot locate the frozen section, if the pipe is behind a wall, or if you have tried these methods for an hour with no success, it is time to call a plumber. Professional plumbers have specialized equipment—like pipe-thawing machines that use electric currents to heat the pipe from the inside out—that can clear a blockage quickly without damaging your home.
The most effective way to thaw a drain pipe depends on whether the frozen section is accessible or hidden behind a wall. how to thaw a drain pipe
Soak towels in hot water, wring them out, and wrap them around the frozen pipe. Replace them every 30 minutes as they cool to maintain constant gentle heat. If you cannot locate the frozen section, if