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Hello, depending on the model number of your Lennox furnace, either the thermostat is failed or there is a problem with the other electronics in the system.
Can you get me the model number of the furnace, and tell me a lot about your technical skills set if want to dig into the control wiring yourself...
OR if none of that is in your skill set ranges, tell me which direction you are from the center of the nearest city and I will see if I can locate a well rated Lennox dealer nearby.