The answer to 'supply line frozen' is that a frozen water supply line is a common issue that can occur during cold weather. This happens when the water inside the pipe freezes, causing a blockage and preventing water from flowing through. Symptoms include no water coming out of faucets or fixtures, and the pipe may feel very cold or have ice buildup on the exterior.
Some common causes of frozen supply lines include inadequate insulation, drafty areas, and pipes located in unheated spaces like attics, crawl spaces, or exterior walls. To resolve this, you'll need to thaw the frozen section of the pipe. This can often be done with a space heater, heat lamp, or by wrapping the pipe in insulation and applying heat. However, if the pipe has burst or the freeze is severe, it's best to call a professional plumber to properly fix the issue and prevent further damage.