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What is the brand and model number of your furnace?
What is brand and model on thermostat?
Try different batteries and make sure they are installed properly (plus/minus) We will go from here.
Did you Try different batteries and make sure they are installed properly (plus/minus) We will go from here.
Try removing batteries and install them backwards for about 10 seconds. Then replace them correctly.Let me know if that works.
Sounds like thermostat has taken a spike.If it will not reset by installing backwards for 5 seconds(That is manufacturers instructions) you will have to replace the thermostat