I have a Nest Learning Thermostat (3rd generation) controlling the one zone of heating in my house and one zone of air conditioning, with red (Rh)/white (W1) wires coming from the boiler system and red (Rc), yellow (Y - cooling), green (G - fan), blue (C), orange (disconnected), black (disconnected), and white (disconnected) wires coming from the air handler for the air conditioning system. This thermostat has its blue wire inserted into its C port, but it reported that it was getting no power from the C-Wire.
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Turns out I had blown the 3-amp fuse in the air handler when installing the thermostat (I crossed some wires).
In case it helps someone in the future, the printed figure at the top is a 3 to indicate its amperage rating, not an "E" like I first thought :).
Nigel Stackhouse
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