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Nest thermostat - heater keeps oscillating on/off

Poonster
Community Member

‎12-31-2023 05:29 PM

I have been using my Nest Learning thermostat for about 2 years now without issues.   However, it started acting up today. 

When I have the mode set to Heat and the temperature setting above the current temperature, my circulation fan starts up but then my heater will oscillate On/Off.  It will stay on anywhere between 1-5 seconds and then turn off.  Then restart again in about 2 seconds.  The entire time the circulating fan stays on.  At the same time, there will be a quick green and then orange indicator light.  The heater never really turns on and I can only get the circulating fan to stop if I drop the temperature setpoint below the current temperature. 

When I have the mode set to Off, there doesn't seem to be any problems.  There are no blinking orange or green lights.

 

Any thoughts on how to resolve this?

I've tried removing it from the wall and plugging in a micro USB in case it was a battery power thing (left it for 5 hours).

Also tried rebooting it by pushing it down for 10 secs.

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Markjosephp
Community Specialist
Community Specialist

‎01-09-2024 10:29 AM

Hello Poonster,

I'm sorry to hear that you're experiencing issues with your Nest Learning Thermostat and your HVAC system that are short-cycling. Based on your description, it seems like there might be a specific issue with the heating function.

Here are a few suggestions to troubleshoot and potentially resolve the problem:

 

  1. Ensure that your thermostat's software is up-to-date. You can do this through the Nest app or by checking the thermostat settings directly. Sometimes, a software glitch may cause such behavior, and updates can address these issues.
  2. Examine the wiring on your thermostat. Make sure all connections are secure and that there are no loose wires. If everything seems fine, you might still consider resealing the wires to ensure a proper connection.
  3. Gather the power readings in the Technical Info settings and check for any wiring reports or message codes that would help us determine potential power-related issues.
  4. Perform a factory reset on your thermostat. This can often resolve erratic behavior. Keep in mind that this will erase your current settings, so be prepared to reconfigure your preferences after the reset.

 

Let us know how it goes.

Best regards,
Mark

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