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Hello, the heat and cool temperatures in the programming are likely set too close together... click here for the programming manual.
Set them all 2 to 4 degrees apart, for instance set cooling at 72F and heating at 68F.
Let me know how it goes.
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Can you tell me specifially and very pointedly exactly what you did? What differential settings did you try (DIFF settings)
It is possible that the thermostat has failed, but this is not a common failure mode.
We can go from there without any time limits