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Nest Thermostat Common Wire Issues

When you install your Nest Thermostat without the common wire, electricity is not continuous. Meaning that your thermostat will have to rely on the battery for power when the thermostat is not activated in heating or cooling mode.

To allow for continuous power, you must install a (fifth wire) common wire. As a nest Certified Professional we make it a point to supply continoues power to the Nest Thermostat for optimum performance and reduction of service call backs.

Nest Gen 3 Learning Thermostat Common Wire Installation
Do you have a common wire connection?

Nest says, ” In most cases, Nest thermostats can charge their built-in battery using your system’s heating and cooling wires.”

But sometimes a common wire is required to ensure continuous operation.

You can read more about Nest Common Wire Here:


  1. Dennis Monacelli

    We have a 2 wire thermostat no common wire how can we hook up the nest learning thermostat or should we return it

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