The answer to 'drain frozen' is that a frozen drain is typically caused by a buildup of ice or debris blocking the pipe. Symptoms include slow or no draining, gurgling sounds, and water backing up. Solutions may include using a drain snake or plunger to try to clear the blockage, or applying heat to the pipe to melt the ice. However, if the drain remains frozen or the issue persists, it's best to call a professional plumber to properly diagnose and fix the problem.
Frozen drains can be a tricky issue for homeowners to address on their own, as the root cause may not be obvious and attempting to force a frozen pipe can lead to further damage. A professional plumber has the tools and expertise to safely and effectively thaw a frozen drain, identify the underlying issue, and make any necessary repairs to prevent future freezing.