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Hello, there was a error made in wiring the thermostat. These are not always as easy to wire as the promotional material and even the wiring instructions indicate.
If you can give me the model number of the new Honeywell smart thermostat, and a photo of the printed circuit card inside your furnace, where the thermostat wires attach that will help, we can begin there.
Tell me if you have a heat pump sitting outside or not, and if it only runs in warm weather or if it runs in the winter a lot as well.
Use the paper clip icon at top right of the tool bar to attach photo's
We can go from there.