: Turn up your thermostat. Even a few degrees can help warm the internal wall cavities where shower pipes are often located. How to Thaw the Pipe
Check for Leaks: As the ice melts, inspect the pipe for cracks. A frozen pipe often splits, but you won't see the leak until the ice turns back into water. What to Do if a Pipe Bursts frozen shower pipe
If the frozen pipe is behind the drywall (common with shower valves), you cannot directly heat the pipe without opening the wall. : Turn up your thermostat
This is the most common and safest method for exposed pipes (like the showerhead arm or pipes in a basement). frozen shower pipe