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You should have a water heater that runs off LP gas. The water heater should have a switch to turn it on in the kitchen or hallway area. Once the switch is turned on the water heater should ignite IF you have good voltage and good gas pressure. If the water heater is working and the water in the tank is hot then the bypass valve might be closed. The bypass valve will be located on the opposite side of the outside cover for the water heater. This means you probably have to access it from inside the RV and allot of times an access panel needs to come out to get to the valve, once you turn that valve you should get hot water. The first step is to see if the hot water heater is even trying to ignite...
Some older water heaters you manually have to light. This is accomplished by removing the outside cover, holding the control knob in the pilot position, gas is then supplied to the pilot orifice which is manually lit with a match or appliance lighter.
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