You may have already done this, but from experience in installing my Nest, the root may be at your furnace/AC. Open it up and look at where the wires go. Make a note of the colors and what connections those colors are hooked up to on your Nest and furnace/AC. You may have already done this, but in my case I could see where my wires were installed incorrectly on the furnace and I could correct it. Just remember to turn off your furnace/AC before moving any wires.
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