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Many times this is due to a faulty control board. Very common on these as they get older. The board can be taken out and tested, but this requires removing the front of the furnace and you might not want to attempt this yourself, but it isn't that hard. Most shops have a board tester and can to this for you. You might want to enlist the help of a good mobile tech here. If you do feel this is a job you can tackle, please let me know and I can direct you further here. I am attaching a link to the Service Manual for this model. Print this out so you have it. Good information! http://bryantrv.com/docs2/docs/hflamefurn04.pdf
If you do need a new board, I would go with an aftermarket board made by Dinosaur Electronics as they are far superior to the OEM boards and have an outstanding warranty. Shop around as the price varies. Should be about $85 or so. These just plug in and take just a few minutes to change out.
Just following up here on your question. I am wondering if you perhaps missed my earlier response or did you get this resolved? Easy to do with the large amount of e-mail most of us get these days! If you need me to resend it, please let me know. Thanks!