“My current wiring does not have a common wire available. Can I connect this thermostat with out It? In the compatibility test it states this unit is, however, when I go through the set up process a call out warning to connect the common wire comes up.”
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Nest thermostats are designed to be able to work efficiently without the need of a power wire when the heating and cooling wires of your system can deliver enough power to keep the thermostat's battery charged up. But some heating/cooling wires unfortunately can't deliver adequate power to Nest thermostats. In such cases, Nest thermostats need a common (C) wire that goes into the C terminal of the thermostat. Since you´ve already checked with our Compatibility Checker tool, the next best step would be to contact a Nest Pro technician to check your system and install a common (C) wire if needed Our support teams are always here to assist you if you have any further questions.You can contact us via the Google Nest support page here: https://support.google.com/googlenest/contactflow
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