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You likely blew the fuse on the board in your furnace. You need to go to the furnace or airhandler and remove the panels to get at the main board inside the unit. There is a 3-5amp slot fuse on the board. Take that off and inspect it to see if it is blown, replace that if so and your thermostat should work fine again.
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Yes but the board that controls the AC is still in the furnace....it is the board that controls both.