I found out it's the bypass was on now there hot water!!! Thanks guys the repair man show me few more things to!!! Thank you all!!

There is water in the tank I turn on hot water it comes through I have found the valve that stops the water going into the hot water tank that is open the water heater kicks on runs then shuts off and the light for pilot light is on telling me it failed

I replaced the thermostat and it fired up got hot then quit and light that says pilot light came on water is going through ok even the electric heater you can hear that kick on too but no hot water the fuse is good on the water heater, only thing left is brain box if there is a bypass where in the hell is it manual does not show hell of a lot I thought air in the gas line but the stove has a real nice blue flame so any more suggestions? My next step is to call RV technician We bought used and they had un- winterized. We do not know where the bypass valve would be located.

I can hear it fire up then it heats but shuts off the electric I can turn on and hear the element heating again no hot water