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The OEM control boards in these are not good quality and I suspect that this one is bad and that the fan relay is cooked. I would get a good after market board made by Dinosaur Electronics and install that in this and I suspect that will resolve this. That is called a "Fan 50 Plus" board. Sail switches and limit switches are pretty durable and only lint or pet hair in the sail switch usually cause issues there. Be sure that you check the LP working pressure in the tank regulator as that should be checked at least once a year. Shop around as the price varies for that board. Hope that helps here. Please get back to me if you need additional input as all follow ups are included in our fee.
The timed delay relay may be defective as well, if you have the older style model. This was just about the time they changed this and put the relay on the board. Those, too, are available from Dinosaur Electronics. You can choose to upgrade to the Fan 50 board here if you want. The older board is called a UIB-S board from them. And you are most welcome! Please take the time to enter in a rating as that is the only way I get credit from the site for my time spent assisting you.