I'm only getting extremely hot water or extremely cold water out of the bathtub faucet. the sink in the bathroom is fine. What causes this?
Water – Cause of only hot or cold water from bathtub faucet
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Related Solutions
In all likelihood you probably don't need to turn it off, but I would still recommend that you do so, if only because you might inadvertently hit the cold side of the faucet when working in the area.
You know the saying - if it can go wrong, it will. What's easier - cleaning up lots of water, or turning the valve off and back on?
The only time I ran into something similar it was due to a failed anti-sweat mixing valve on a toilet that allowed back-flow through the hot water pipes. That would also explain in your case why the kitchen sink doesn't seem to be effected by the issue.
About the only way I can think of to test this theory (without opening walls) would be if you can cut your cold water off to the bathrooms without cutting the supply to the hot water heater. In the unlikely event that you can do that, your toilets would still be able to fill from the hot water line when flushed.
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Best Answer
Usually a bad cartridge in the control valve.
Those can be replaced, with more or less trouble depending on design and the particular installation.