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New Nest Thermostat - Heat does not deactivate when temperature setpoint is reached.

JayEdRoX
Community Member

‎01-12-2024 08:03 AM

Just installed a Nest Thermostat.

Wiring:

Y - Heat/Cool

C - 24v Common

G - Fan

R - Power

O/B - Heat Pump

I had to change the heat pump to B wire to have the system blow hot air. So all is good here.

However, the system continues to heat indefinitely. For examples, at a setpoint of 64F, the thermostat reports the room temperature as 77F, yet the fan and heat continue to blow. I have to turn off the heat altogether to stop the hot air from blowing.

Where should I start troubleshooting?

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2 REPLIES 2

JayEdRoX
Community Member

‎01-12-2024 08:06 AM

Also - the Google Home app forces me to select "Electric" as my heat fuel source for this thermostat. My HVAC uses propane. Does this affect anything operationally?

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Markjosephp
Community Specialist
Community Specialist
In response to JayEdRoX

‎01-20-2024 02:48 PM

Hello JayEdRoX,

 

Thank you for sharing your recent installation of the Nest Thermostat and providing detailed information about the wiring configuration. 

I understand that you are currently facing an issue where the heating system appears to operate indefinitely, even after reaching the desired setpoint. To troubleshoot the ongoing heating issue, here are a few steps you can consider:

 

  1. Make sure your Nest Thermostat is set to the correct mode (heat or cool) and that the setpoint temperature is accurate. Verify that the thermostat is not in some sort of manual override mode.
  2. Double-check your wiring connections to ensure they match the configuration you mentioned. Any loose or incorrect connections could lead to issues with temperature control.
  3. Since you mentioned changing the heat pump wire to 'B' for hot air, review the configuration settings on your Nest Thermostat related to heat pump operation. Ensure that the settings align with your system specifications.
  4. Verify that the Nest Thermostat's temperature sensor is not obstructed and is accurately reflecting the room temperature. Additionally, confirm that the thermostat is installed in an optimal location away from heat sources and drafts.

 

Let me know how it goes.

Best,
Mark

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