Nest Learning Thermostat (3rd Gen) Keeps Ignoring Temperature Sensor it is Connected To

[relero90]

My Nest thermostat lives downstairs in my home. We have a significant temperature difference between that location and our second story, so we have a Nest Temperature Sensor that lives in our master bedroom and is usually the location we ask it to consider as its source of temperature truth. This has worked for a while, but I'm now intermittently running into an issue.

The thermostat shows a successful connection to the temperature sensor upstairs and can display the temperature reading there, but even when pointed to that sensor, it is still using the downstairs temperature at the thermostat instead. I keep waking up in the middle of the night to a 78-degree bedroom when my heat is set to 67 degrees because it is reading the downstairs temperature as the upstairs temperature.

Nest app says it has a successful connection to the temperature sensor and that the battery level on the sensor is fine. I've tried deleting and reestablishing the pairing between the sensor and the thermostat to no avail. I've tried moving the sensor to different locations in that bedroom. The problem persists.

I'd love to attach an app screenshot of what I'm seeing here but all I get is a link option so here is a link to a public google drawing with the screenshot: https://docs.google.com/drawings/d/e/2PACX-1vRLozBwe1bt3tFdlwflxYQB6HxBmQlgU7juuJx6eJe_ffiWYfDC8F4Jn...Please note that Nest can read the temp in the master bedroom and is pointed at that sensor but is still setting its current temp from the downstairs thermostat. Anybody have any ideas?

[sicsacol]

Hi @relero90,

Thanks for posting in the community forum. I'm sorry to hear you're experiencing this temperature reading issue with your Nest Thermostat and your Nest Sensor. Don't worry, let's work together to figure out what's going on.

First, we need to make sure the temperature reading issue isn't with the Nest Thermostat or Nest Sensor. If you have a thermometer, you can measure the temperature of the room where the thermostat is located to see if the reading is the same as what the thermometer shows. Do this also with the Nest Sensor. Please take a photo of the thermometer next to the Nest Thermostat and share it.

This information will help me provide further assistance. Feel free to share any other information that may be helpful.

Best regards,
Jonathan

[relero90]

Hi Jonathan,

I think you may have misunderstood my problem. Both the thermostat and the nest sensor are reading temperature at their locations accurately and without issue.

The problem is that the system (thermostat + sensor together) intermittently doesn't respect which location it is pointed at. If you see in the screenshot I provided in my original post, the dot indicating the supposed active reading location is filled in next to Master Bedroom (the nest sensor showing an accurate reading of 71 degrees) but for some reason the temperature reading on the circular wheel display at the top of the screen is using the temperature from the downstairs thermostat (65 degrees). As such, when the heat is set to 70 degrees and the temperature reading is supposed to point at the Master Bedroom where current temp is higher than the set temperature, heat is still blowing.

Hope that makes sense.

Sincerely,

Becca

[sicsacol]

Hi @relero90,

Thanks for your reply. I appreciate you clarifying the issue with your Nest thermostat and Nest sensor. It seems the Nest thermostat is ignoring the temperature from the Nest sensor, which may be because the thermostat has its own active sensor and is setting the temperature based on its own reading. Don't worry, let's try the following:

• Since you have a Nest Learning Thermostat, I recommend deactivating the auto-learning feature, as this can cause the thermostat to revert to previously learned temperature settings.
• Check if you have any schedules set on your Nest thermostat. If so, please delete them.
• You can also adjust the Eco mode. This option allows the thermostat to switch to cooling mode to save energy. You can configure it to maintain either cooling or heating instead.

Let me know how it goes after trying these steps. Any additional details you can provide will be helpful.

Cheers,

Jonathan