THERE SHOULD BE A FUSED SERVICE OUTSIDE BY THE UNIT CHECK THESE FUSES AND SEE
The fact the thermostat doesn't light up means its not getting power which would normally come from a small transformer inside the furnace or air handler. In most cases there is a switch located on the side of the furnace or immediately next to it. Quite often the switch with inadvertently get turned of by a child. Simply turn the switch back on if thats the case and everything should work just fine once again.
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