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Try turning power off and back on to furnace to reset board.Let me know if it still does not work if you have flashing lights on furnace control board and pattern of flash.
Does motor still run with thermostat off?
OK if you call for heat does the small vent motor come on and will igniter or burners light?
Ok can you give e complete model on furnace (label above burners on side panel) and tell me if you have glow bar or spark igniter.See below
If igniter is not glowing look closely and see if it is broken or has a burned spot on it.
May have had a slight amount of carbon built up. Let me know if you have any more problems.
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