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Nest thermostat star connector

A Nest thermostat’s star Star connector icon connector or Star connector icon O/B connector can be used to control several different system functions, depending on what type of system you have. For example, you can use the star connector to connect a wire that controls a humidifier or dehumidifier, or emergency heat. 

  • During setup, the app will give you a custom wiring diagram to install your Nest thermostat. You should only insert a wire into the thermostat’s star connector if the wiring diagram tells you to.
  • If the app tells you to put a wire into the star connector during setup, your thermostat will ask you to tell it which wire it is, and what it controls. 
  • No matter which Nest thermostat you have, you can only put one wire into the star Star connector icon connector, so only one function is supported at a time.

Important: If you’ve connected a humidifier, dehumidifier, or multi-speed fan wire to the star connector, we strongly recommend that you get help from a pro. Make an appointment with our installation partner OnTech, to have a trained pro come to your home, install and set up your Nest products.

Differences between Nest thermostat star Star connector icon connectors

Different wires and features are supported by Nest Learning Thermostats, the Nest Thermostat E, and the Nest Thermostat. 

2nd and 3rd generation Nest Learning Thermostat

Nest Learning Thermostats have a standalone star connector on the base.

Thermostat back plate, star connector highlighted

System wire



Stage 3 heating


Emergency heat


Whole-home humidification


Whole-home dehumidification


3rd speed for multi-speed fans


Nest Thermostat E and Nest Thermostat

The Nest Thermostat E and the Nest Thermostat’s star Star connector icon connector also have an O/B label because it can alternately be used as an O/B connector for heat pump systems.

Nest Thermostat E

Thermostat backing plate, star connector highlighted

Nest Thermostat

System wire



Stage 2 cooling


Stage 2 heating


Heat pump heat/cool changeover valve

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