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Nest Power Connector

Elmlion
Community Member

I purchased a Nest Thermostat to control a 3 zone (valve) boiler.  My thermostat wires are a R and W.  The R wire is 24 volts.  I purchased the Nest Power Connector to provide a C wire.  I connected my thermostat wiring R wire and W wires the R and W on the connector. I wired the R,W,&C wires from the connector to the R,W& C ports on the nest wall adaptor socket.  

On setup the R & C wires are recognized but the W wire is not.  I made sure that the connections are tight.  I measured the voltages from the connector and the R to C was 25 volts.  The R to W is variable from 6 volts to 1. 

What do I need to do as the setup terminates?  

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