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Hi my name is Robert.....
IF it does not smell right and it continues to run it could be a LP pressure issue. What I would do is have a RV shop hook up a manometer to check the line pressure, it is a 30 mins check and they can tell if that is the issue, it should be checked yearly. IF it is not a LP problem I would blow out the exhaust really good, make sure you have safety glasses on, after that the unit might need to be pulled and the gaskets on the burner chamber checked. If it does not smell right I would have the pressure checked out..
Hope this helps some, IF you have more questions or concerns please feel free to contact me..... Robert
IF you are satisfied with my efforts please feel free to select a STAR rating on the page, it is the only way I get credit for helping out.... Robert