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Nest Themostat Common C Wire

tdevaney
Community Member

Nest Themostat has been working well for the past 2 years.  I have two zones, and two thermostats.  One of them gave me an error message about not being able to detect a common c wire.  Now this thermosat is no longer online and operating the AC unit.  The Common C wire appears to be connected when I removed the thermostat.  I have had no issues since I installed the thermostat.  Any suggestions of where else I can check?

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