Fault in hot water tub
When I woke up this morning, I turned on the bathtub faucet, but once I switched it over to the hot side, water stopped coming out (as if I was putting it into the off position).
I just recently changed my showerhead with one of those that has a 6ft cord on it...not sure if that is related.
Re: Fault in hot water tub
You may have a pressure-balanced type of shower valve, and they can be stuck in the "cold" position. You will need to turn off the water main, and then take it apart for inspection, lube, or possible new cartridge.