crwdns2934241:0crwdne2934241:0 Bruce Arnott

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Usually there is a long troubleshooting section available inside owner’s manual for Nest tstats.  You can find your model [https://www.thermostatmanuals.com/nest/|here]. You should see some error code if it can’t connect. To understand the message just open the manual on troubleshooting page. The reason usually very simple: some wire not connected.

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open