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Please help me connect the blue "C" common wire in boiler control board for Google Nest Thermostat : r/Nest
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Installed Nest Thermostat. Have a blue wire I did not connect to anything but the system works. What's the risk? : r/hvacadvice
Nest thermostat not seeing the C wire but it's there... | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
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