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This could be a limit switch, shutting the furnace off, then cooling off, then starting back up because of a blockage. There may be an obstruction in the discharge air, or intake air causing the furnace to overheat.
I would have to see exactly what is happening to be of more help. I would check, or have them check for a blockage, or something in the fan blades causing it to not move much air.
Can you feel a forceful air discharge?
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