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How many wires are you dealing with? If I recall, there is a wiring diagram on the back of the mounting plate on those. I think these are a heat/cool thermo? You may need to see which wires are hooked to which on the furnace control board.
 

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Easy fix. Go to where the furnace is, copy what colors go to what terminals, then go to the thermostat and hook same to same. Easy peasy, should be done in less than 15 min's.
 
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