topic Re: Nest randomly changes temp to 50 or 90 degrees in Nest Thermostats

Nest randomly changes temp to 50 or 90 degrees

Divamac — Fri, 05 Nov 2021 14:29:01 GMT

This is my second Nest with the same issue. First was replaced under warranty but the same problem persists. It’s a 3rd Gen thermostat.

unit was professionally installed 3 years ago with a new HVAC system.

The thermostat is usually set to Eco mode, but it will randomly change temperature to 50 or 90 degrees on its own. I’ve reset, powered off, turned off every automated feature (no schedule, no home/away, no learning) and I now have the thermostat covered with a box so it’s motion sensor is blocked. It’s not a security/access issue. Hours have been spent on the phone troubleshooting. Again, this is the second unit with the same issue.

I’m ready to replace it with something else. I see this issue posted elsewhere with no fixes offered. Has anyone found a solution?

Re: Nest randomly changes temp to 50 or 90 degrees

Shammy — Tue, 09 Nov 2021 06:10:47 GMT

Me too. Just had AC come on — thermostat was set to 55 degrees! Neither me or my husband did THAT!

Re: Nest randomly changes temp to 50 or 90 degrees

Shammy — Thu, 11 Nov 2021 05:50:35 GMT

And this evening we suddenly realized the heat was set to 80 degrees! That’s nuts. Either Google has a bug or their system has been hacked to hack mine!

Re: Nest randomly changes temp to 50 or 90 degrees

AmberJack — Fri, 12 Nov 2021 22:36:52 GMT

Omg, I have the same issue! I constantly have to check to make sure it's not changed to some crazy temperature.

Has anyone found a fix?

Re: Nest randomly changes temp to 50 or 90 degrees

Scott25929 — Mon, 22 Nov 2021 22:40:42 GMT

Ugh me too. I get home from work and the house is set to 50. So annoying

Re: Nest randomly changes temp to 50 or 90 degrees

Amacrae — Mon, 29 Nov 2021 08:26:06 GMT

I have the same issue heating set to 14c at night and scheduled to 19c at 6am, however at 3am the heating temperature changes itself to 19c.

Any help would be greatly appreciated as at the moment I have to switch heat off and then get up at 6am to set back to heat.

Auto learning is off.

Re: Nest randomly changes temp to 50 or 90 degrees

MoneyOverMen — Sat, 11 Dec 2021 04:42:02 GMT

I have something very similar. It changes the thermostat to 68 degrees in the winter. Wakes me up every single time because it gets so hot! I turn it down every single day. It's cost me a lot of money with this thermostat! So **bleep** hot! It even overrides the settings to bring it up to 68 degrees.

Re: Nest randomly changes temp to 50 or 90 degrees

AmberJack — Sat, 11 Dec 2021 18:42:16 GMT

Please EVERYBODY post a fix for this if/when you find one.

What are we going to do? Mine is still on the fritz, changes temperature constantly and goes from heat to eco, ac to eco and even changes the set temp in eco. I don't want to buy a new thermostat 😪

Re: Nest randomly changes temp to 50 or 90 degrees

AmberJack — Sat, 11 Dec 2021 18:44:03 GMT

I constantly have to monitor my thermostat throughout the day via phone.

Do you have that option?

Re: Nest randomly changes temp to 50 or 90 degrees

Divamac — Sat, 11 Dec 2021 19:32:15 GMT

I still don’t have a fix. Even covered with a box and powered off, with all automations turned off, it turns itself on to 90 degrees or to 55 degrees. I don’t see that the manufacturer cares at all about it.

Re: Nest randomly changes temp to 50 or 90 degrees

dadude — Tue, 14 Dec 2021 04:04:14 GMT

This is getting old… and a bit dangerous. Google needs to fix this.

Re: Nest randomly changes temp to 50 or 90 degrees

MoneyOverMen — Tue, 14 Dec 2021 05:38:58 GMT

Ok...I was bound and determined to find something. If your temps are consistent, it has to be a setting. So what I found was, in Settings, and you have the chart that shows all the temps your thermostat was going to...you can change those temperatures. Just go into that graph one by one and change it to what you want. Somewhere along the line, they must have come preset with funky temperature settings. There has to be a better way than to do it manually like this, but that solved my problem. You can also do that on the thermostat. Go into Settings and change it. These temps were coming from somewhere. And I found them there in Settings. If you need more help, let me know. Signed...Finally sleeping without checking my thermostat all night!!!

Re: Nest randomly changes temp to 50 or 90 degrees

MoneyOverMen — Tue, 14 Dec 2021 05:40:18 GMT

Check my reply. The answer is in Settings. I don't know how it got there where these temperatures are like that, but it can be changed.

Re: Nest randomly changes temp to 50 or 90 degrees

Divamac — Tue, 14 Dec 2021 15:57:29 GMT

Yes. I work from home, so as soon as I hear the unit come on, I turn it off.

I keep the unit on the OFF setting now. It turns itself in to 90 degrees randomly. I’m going to have to buy a different (non-Nest) unit. This is too frustrating.

Re: Nest randomly changes temp to 50 or 90 degrees

Divamac — Tue, 14 Dec 2021 16:01:53 GMT

Scheduling is turned off on my unit. All automations and learning settings are off. It happens randomly. I’ve been troubleshooting this for years without a solution.

Re: Nest randomly changes temp to 50 or 90 degrees

Divamac — Tue, 14 Dec 2021 16:02:59 GMT

Re: Nest randomly changes temp to 50 or 90 degrees

Fera — Thu, 16 Dec 2021 13:56:38 GMT

I am trying to find location of this graph can you please give me a little more detail on where you found it. I only see active history and no graph there thank you Stan

Re: Nest randomly changes temp to 50 or 90 degrees

Divamac — Thu, 16 Dec 2021 15:30:15 GMT

This is the Schedule you access from the main app screen.

Re: Nest randomly changes temp to 50 or 90 degrees

Divamac — Thu, 16 Dec 2021 15:31:36 GMT

Re: Nest randomly changes temp to 50 or 90 degrees

Divamac — Thu, 16 Dec 2021 18:23:43 GMT

UPDATE: Google support said that the Nest requires all wiring to be solid copper, not stranded wire. My main wire from the furnace to my thermostat is stranded wire. So instead of paying $250 to have a new wire run, I am opting to replace my Nest with a different thermostat. I’ve had all the automations and learning turned off for more than 2 years, so I’m not losing anything but the aggravation of a thermostat that’s trying to boil me alive. 😂

im attaching some photos of my chat with Google in hopes it helps some of you resolve your issues.