On a 2012 23D acquired last month.....affecting shower and both sinks, less so at kitchen. Water flow mix heats up as expected, then goes to hot only from both the hot and cold sides. And then the hot is totally gone, like I drained the tank, which isn't possible. Thoughts before I call a mobile repair, as we're traveling?
Possibly the mixing/tempering valve on the back of the water heater has gone bad? Maybe check your owner's manual to confirm you have one, and check its location. If accessible, you may be able to swap it out yourself IMO.
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