Plumbing Questions? Ask a Plumber and Get Answers ASAP.
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Are you saying the water is not hot or there is no water coming out of the hot side of the faucet?
That wasn't a yes or no question. Which is it? not hot or no water?
Given your description a frozen pipe is the most likely culprit. The best things to do are: keep the hot and cold faucet open as long as someone is home and awake, get as much heat into the areas where the piping runs as possible and you can use a hair dryer or a heat gun (basically a hair dryer on steroids) on exposed piping. Leaving the faucets open will minimizes the chances that the pipe will break. A plumber with a pipe thawing machine can thaw out your concealed pipes if the piping is copper.