My furnace did the same until I resoldered bad pc board connection one time, and another time I had an issue with wasps building nest in compustion chamber,stopping ignition. The blower will continue to run if the thermostat calls for heat. When you get your new board, don't throw the old one away maybe a electronic friend could fix it and have a spare. Bugs, ugh! Once I had stink bugs lined up in my hotwater tank combustion chamber blocking off the air, lots of black smoke because of not enough air (incomplete combustion). Good luck.
Ken
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Ken & Karen & Rusty( puppy dog)
1994 Fleetwood Coronado 28.5' F53, Rebuild E4OD with upgrades, Banks Power, 2005 Dodge Dakota toad with Even Brake, Ultra Trac rear track bar
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