Frozen pipes generally ... or a portable space heater (kept away from flammable materials), or by wrapping pipes with towels soaked in hot water. As tempting as it may be, do not use a blowtorch ...
There is no guarantee your pipes won't freeze in the bitter cold. But you can try to prevent it by keeping a slight drip on faucets. This keeps water flowing instead of freezing as it sits still. You ...
Apply heat with a hairdryer, hot towel, or space heater to the frozen section of the pipe until it thaws and water is restored. If you're unable to find the frozen pipe, or if it's not accessible ...