Originally Posted by bloomer
sounds good but I don't really know where the control board is located at
Hate to say I told you so, but........
Did you check your grounds? already? remove them and clean them with a finger nail sanding board that your wife uses. There should be a ground from the frame of the water heater to the frame of your trailer, make sure that is clean too! Bypass your low limit temp sensor and then your hi limit sensor.
My money is still on the control board.......
Control board is on the top left corner under the water heater cover on the exterior of your coach/trailer. It is a black looking rectangular box with a either a 5 or 6 connector plug on it. Held by 2 screws. Amazon prime can get you one in 2 days. Last I checked they were $125. It is good to keep a spare around. Then when it works, take the old one back to the dealer for a warranty replacement.