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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
The most common cause if this is a bad control board. These are made in China and poor quality. I only sell a good after market board made in Oregon in my shop made by Dinosaur Electronics. If this is a furnace made after about 2002 then that board is called a "Fan 50 Plus" version. You can remove your board and take it into a shop for testing. Hope that proves helpful here. Please get back to me if we need to dig deeper into this as all follow ups are included in our fee.
You don't have to remove the furnace to get to the control board and remove for testing. Once you get the board checked and rule out that as a proximate cause we can proceed to the next step. I have you the most probable cause of this problem, but not the only cause of the problem. We can discuss this in a phone chat if you want and cover whatever you need to know and how to do further tests without a trip to the shop which will cost way over the $29 here.
I suppose I should have said that you don't have to remove the complete furnace here, but only have to pull the "guts" out of the housing. That requires removing one screw in the front and disconnecting the LP line and removing the power plug to the furnace. Much easier to do this over the phone, but you decide if that is worth the added 5 bucks.
You might find the attached manual link helpful. http://bryantrv.com/docs2/docs/subntnew.pdf
10-4. Let me know if you need more input on this.