topic Re: Preheating too early in Nest Thermostats

Preheating too early

zunkman — Sun, 28 Apr 2024 02:25:49 GMT

I have my Nest Thermostat set to raise the temp from 72 to 74 at 1:00 PM. I have Early On set to a maximum of 1 hour. It has worked fine for over a year. Today, the thermostat turned on the furnace (forced air / gas) at 11:00 AM, which is 2 hours early. The house was 74 within 20 minutes. I have not changed any settings for at least 3 months. Why is this happening?

I have owned some manner of Nest Thermostat for many years, so I know and have checked all the settings that could affect this behavior. The only thing I can't check is the software, which I have to assume is the culprit in this case.

I know I can reset the thermostat, or I can Factory Reset it, but I'd like to know why this is happening. I will keep an eye on it for a few days to see if this problem is duplicated. But, until then, hoping for some explanation,

Thanks

Zunkman

Re: Preheating too early

AxelD — Wed, 01 May 2024 22:22:31 GMT

Hi zunkman,

Sorry to hear about this situation with your Nest Thermostat. No worries, help is here! Here you have some troubleshooting steps that might help to solve it:

1. You may have a schedule but you aren't aware. Perform a Reset only on the schedules:

Go to Settings Nest settings icon > Reset > Schedule
Follow the instructions on the screen

2. Check if the Auto-Schedule is ON. You can turn it off, so your thermostat won't make any changes by itself.

Here are the steps for How Nest thermostats learn.

3. Perform a Factory Reset on the thermostat:

Go to Settings Nest settings icon > Reset > All Settings

Let me know how that works.

Regards,

Axel.

Re: Preheating too early

zunkman — Wed, 01 May 2024 22:46:34 GMT

Hi AxelD, thanks for the response.

Allow me to preface my answer by saying that I am an IT Specialist, and I always check the obvious (and more) before asking for help.

1) My schedules are fine. I programmed and checked them many times.

2) Auto schedule is off. It has been off since I installed my thermostat 15 months ago.

3) Factory reset is far down the list of absolute last resorts for me. I have many routines and automations that depend on my Nest Thermostat, and a Factory Reset of the Thermostat would require literally days of re-adjusting those routines and automations.

If it's any help, based on my logs, this behavior started on April 1 (No Fooling). There was an obvious change to the way the logs are recorded starting on that date. Was there a software update around that date?

Again, thanks for your suggestions, but I firmly believe it is a software issue.

Dan