Check to see if setiment has settled on the pilot....blow it out with air if it has. This issue comes up often with water heaters and rv refers. If that is not the problem and the pilot remains lit, but never increases when the thermostat is turned up, you probably need a new gas valve/thermostat.
Do not use compressed air to blow out the orifice or burner tube as the orifice is a manmade ruby and could be damaged which will cause further water heater failure. Compressed air could also force debris into the orifice and create more problems. Simply remove the burner tube and gently tap on a hard surface to remove any loose debris. To clean the orifice you will need distilled alcohol to soak the orifice in and then allow to air dry. Do not run a wire cleaner through the orifice as the opening is laser cut with a spiral which creates air draw to allow the flame to burn properly. If the water heater is lighting but not producing hot water, more than like you have a closed valve on the back of the water heater. Make sure the bottom and top valves are open and the middle valve is closed. The top is hot water out, the bottom is cld water in and the middle valve is winterization bypass If you have an questions please feel free to contact me at [email protected]
ditto^^^^^^^
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Check the water heater bypass valves behind the heater are they in bypass or is the blender valve open between hot and cold? It should be shut or closed when using hot water
It's possible that your system is working correctly but one quite unknown thing can cause the water to be only lukewarm. If you have an outside shower or outside faucet by the dump tank panel check to make sure that the water knobs are turned off there. Sometimes someone will turn both hot and cold water on at the outside shower controls and turn off the flow using the shower head shutoff instead of the knobs. This allows the cold and hot water to mix and make the flow inside the RV to be only slightly warm.
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