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That means you have no power to the rh wire. The nest requires 24 volt a/c power to operate. This is provided through the r wire and the c wire (common). Some systems have separate.
As you can see, we have lot. The most common issue with a nest thermostat not working right is causes by the lack of the c or common wire. A common wire can be used to provide continuous power to a heating and cooling system. From all of the problems reported here you may have a 50% chance of it working without a c on a two wire system. Using a transformer is fine with the nest 3rd gen but is not as good for the. Get the nest power connector here: Turned out the c wire had 24vac in it at the thermostat and it should not. With it disconnected all was well. The c wire was never used until the ac was added, and it was.
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