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What is the brand and model number of your heating equipment? I assume you turned the power back on to it.
Ok that's the thermostat. I need brand and model number of the heating equipment (furnace, boiler, etc)
If your thermostat doesn't have batteries then t get's its power from the furnace. There's a pretty good chance this is a furnace not a thermostat issue. If you turned the power back on to the furnace then you may have to get a pro in to check it out.