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Hello, it is generally the units printed circuit board that is bad causing the problem (80% chance, 20% chance the problem is in the thermostat or the furnaces high limit control (2%)
Tell me a lot about your technical skills with electronics and controls circuits and if you have a multi meter or not so that I can coach you most effectively.
Or.. if none of that is in your skills sets range, tell me which direction you are from the center of the nearest city and I see how many well rated service outfits that are in your area.