First obvious thing is to make sure all the valves are in the correct position. Are you getting hot water at the kitchen sink? I don't know the layout of your coach, but in mine the hot water line comes out of the heater and seperates into two lines. One goes to the kitchen sink and the other to the bathroom. If the kitchen sink has hot water and the bathroom does not, you probably have a clogged line somewhere between where the line separates and the bathroom. If the hot water line to the bathroom sink can be easily disconnected you might try disconnecting it and seeing if you are getting water that far. Also remove the shower head and see if hot water flows. If that does not work, you might have to blow the line out with compressed air.
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