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All the inside faucets and shower work on cold side but not hot side. They were working fine wife was brushing teeth then the hot water just stopped like you turned the faucet off.
I would guess this to be a check valve failure in the hot supply line at the water heater. My buddies did that, and other than having to crawl in the basement too access the rear of the wh, it was a $5 part and 15 minute job.
Just a guess