Your White-Rodgers thermostat may be faulty for a number of reasons. The problem may be as simple as needing to replace the batteries. However, your home's power supply may have blown a fuse or have a tripped breakers, especially if your heating and cooling systems run continuously. Another reason your thermostat isn't working is if there's a short in any of its wires.
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HomeX virtual experts will assess your issue (for free!) and can resolve simple problems.