cancel
Showing results for 
Search instead for 
Did you mean: 
Replies are disabled for this topic. Start a new one or visit our Help Center.

Nest showing wrong room temperature

mabrintnall
Community Member

My Nest (3rd generation learning) periodically and suddenly reports that the temperature in my house is very warm – say 88 degrees – when the house is in fact cool - say mid-60’s.  The Nest may or may not be warm to the touch.  To get the heat to come in, if I set the thermostat higher than its reported room temperature (say 90), the heat will come on and the Nest temperature reading will begin to correct itself and generally drop back down to close to room temperature. 

I’ve contacted Nest and tried various fixes, such as disconnecting from wireless, to no effect.  They replaced my Nest and the new one has exhibited the same behavior.

My HVAC company has confirmed the wiring is correct, and have no explanation.  I have a single stage HVAC system that has worked properly until this new problem.

Given that two new Nests show this same behavior I assume the cause is with my system or setup. Possibly my HVAC system was damaged in a power surge, though it itself seems to operate properly.

I’m in the Washington DC area;  the issue seems to emerge most prominently as the weather nears 32 degrees or below. 

Any advice on what the cause of such behavior might be or what system repairs I should try?

 

1 REPLY 1

zoeuvre
Community Specialist
Community Specialist

Hi mabrintnall, 

 

Uh-oh! If you've already tried various troubleshooting steps and have replaced your Nest Thermostat with a new one, but the issue persists, it's possible that the problem lies with your HVAC system or its compatibility with the Nest Thermostat. Here are a few suggestions to further investigate and address the issue:

 

  1. Even though your HVAC company confirmed the wiring is correct, it's worth double-checking the wiring connections between the thermostat and the HVAC system. Ensure that the wires are securely connected to their designated terminals and that there are no loose or damaged wires. Kindly send us a wiring photo of your previous thermostat, how are the wires connected to your control board, and how are the wires connected to your Nest Learning Thermostat.
  2. As you mentioned the possibility of a power surge damaging your HVAC system, it's worth investigating further. Check the power supply to your HVAC system and ensure it is stable and within the required voltage range. Consider consulting an electrician to assess the power supply and determine if any surge protection devices are necessary to protect your HVAC system and thermostat.
  3. If the issue persists and you've exhausted all troubleshooting steps, it's advisable to contact a professional HVAC technician. They can thoroughly inspect your HVAC system, identify any underlying issues, and provide appropriate repairs or recommendations. They may also have specific knowledge and experience with Nest thermostat integrations and can offer insights based on their expertise.

 

It's important to gather as much information as possible about the behavior of your system, such as when the issue occurs, any specific patterns related to outside temperature, and any error messages displayed by the Nest thermostat. This information will be valuable in assisting the HVAC technician in diagnosing the problem accurately. By working closely with an HVAC professional, you can obtain a comprehensive assessment of your system and address any underlying issues that may be causing the inconsistent temperature readings and operation.

 

Keep us posted.

 

Best,

Zoe