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Cincinnati, OH
reply to mattmag

Re: New Nest Thermostat- 2 stage

I'm not sure either, but they told me last night that the symptom was the blower not coming on, and my neighbor confirmed that today. All I can tell you is that the system is a 2 stage A/C (I think the A/C unit controls the stage 1 vs stage 2 and not the Nest) and electric resistance forced air heat (which I've never used). There are only 3 wires hooked to the Nest: Rh, W1, and Y1. It worked perfectly since I installed it in June, until yesterday after the software update.