j-d wrote:
^^^ I agree this thread is getting hard to follow. So at the risk of redundancy:
Have you verified that the 120 VAC supply to the water heater is solid? I went through a lot of trouble and a couple OP's here suggested the problem could be in a junction/splice box.
It is possible but very unlikely because the issue is (was) repeatable and has an exact behavior. On electric heating, it heats the water the first time but does cycle heat after the initial heating (electric only, propane works as expected).
Now that it is working I have to wonder what I disturbed when I pulled the inspection covers from the thermostats and the heating element.
I hate problems like this, if something is going to break, then break and stay broken so I can find you and replace you :)
I'm going to pull the A/C thermostat and see if there is any corrosion/dirt between the sensor and the tank that could be causing an issue.