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Need Help with wires to connect to Nest Learning Thermostat

NicNg
Community Member

‎11-21-2023 07:18 PM

So I have a dual fuel central HVAC system that heats and cools through forced air. The second fuel is Oil, but it is only used in extremely cold situations.

My current thermostat has these plugs:

W2     E     O/B     R

L         G        C      Y

There’s a wire connecting W2 to E and besides that, there are 6 wires coming from the wall and connecting to W2, O/B, R, G, C, Y.

When I tried installing my Nest Learning Thermostat, I placed the six wires like so:

W2 —> W2/Aux

O/B —> O/B

R —> Rc

G —> G

C —> C

Y —> Y1

After having done so, everything turned on fine on the Nest Learning Thermostat, but there was no air being pushed through the vents. During the setup on, I chose Forced Air for all the options.

Anything I should try before calling a technician?

Thank you!

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Markjosephp
Community Specialist
Community Specialist

‎12-05-2023 10:10 AM

Hello NicNg,

Thanks for reaching out! It seems like you've made a good attempt at installing your Nest Learning Thermostat. However, the issue with no air being pushed through the vents might be related to the wiring configuration or thermostat settings. Here are a few things you can try before calling a technician:

 

  • Check Wiring Connections:
    • Double-check the wiring connections to ensure they match the original thermostat's configuration. Make sure there are no loose wires or connections. Also, confirm that the wire connecting W2 is placed correctly, as this can impact the heating function.
  • Thermostat Settings:
    • In addition to selecting "Forced Air" during setup, ensure that you've set the thermostat to the correct mode (heating or cooling) based on your current HVAC needs. The Nest Thermostat should be able to handle dual fuel systems, but confirm that it recognizes both heating sources.
  • Test Heating and Cooling Separately:
    • Try testing the heating and cooling functions separately to identify if the issue is specific to one of them. This might help you pinpoint the source of the problem.
  • Reset and Reconfigure:
    • If all else fails, try resetting the thermostat to its factory settings and then reconfigure it. This can sometimes resolve configuration issues that may be causing the problem.

 

Keep me posted.

Regards,
Mark

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