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Start by checking the LP working pressure at the tank regulator. That needs to be checked and adjusted at least once a year and is often neglected. Some aren't adjustable and may have to be replaced if they aren't in spec range. That and low voltage are the two largest sources of problems in these. I am attaching a link to the Atwood Service Manual for this model. Print out a copy or at least Bookmark it so you can come back to it again later. Hope this proves helpful. Please get back to me if you need more once you have checked this. http://bryantrv.com/docs2/docs/hflamefurn04.pdf