First thing to do is open the outside panel behind the water heater. Look for the two black rubber-covered buttons toward the upper left of the heater. Push both of them firmly. If either one clicks, you have probably found the problem. This is a rare problem, but sometimes it happens, and it is easy to check.
Much more likely is that one way or another, one time or another, the electric heating element got burned out. You can replace it yourself - it is easy, and will cost you less than $30. Or you can go to any RV service place including any RV dealer with a service department. Expect to pay a bit more, but the bigger problem will be getting an appointment. RV service places are very busy right now.
If you decide to do it yourself, there is a step-by-step tutorial in the TM Technical Library titled Replacing the water heater's electric heating element. It is somewhat wordy, but tells you everything you need to know as you walk through it. You can also see the black buttons mentioned above in the photos included there.
Incidentally, you should see hot water within 10 minutes of turning on either the electric element or gas burner. No need to wait an hour.
Bill
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