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This is usually one of two problems. Either the LP pressure at the tank regulator is too low OR the control board is not sensing the flame and shuts down the gas valve. The pressure can be checked with a manometer by most shops. Ditto with the control board. Low input DC voltage can do this as well. You need at least 11 VDC to the board in order for the furnace to work properly. That can be measured with a small digital multimeter like you can buy at most hardware stores. About $20 ro so and easy to use. I am adding a link to the Atwood Furnace manual for you. Print out a copy so you have it. Lots of good information in there. Please get back to me if you need more on this as all follow ups are included in our fee. http://bryantrv.com/docs2/docs/hflamefurn04.pdf
Just checking back in, Robert, to see if you were able to get the furnace fired up or do we need to dig deeper into the problem?