Dear Ed,
To save some money and effort, get an electric meter and check to wires to the water mixer to see if the electricity is coming to the mixer when you tell it to use the "hot".
Then, check the filter screen either in the hot water hose (found on either end) or the hot water connection in the mixing valve.
They can plug up with sediment preventing water flow.
Finally, you can change the mixing valve it you are sure the electricity is coming to it during the hot cycle, and you are sure the water is flowing freely out of the hot water hose.
God bless your efforts.
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