Nest randomly changes temp to 50 or 90 degrees

[Divamac]

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?

[mikefnewark]

yes i agree i have an Ecobee in another house & it works great- it actually replaced a Nest. looks like i'll have to replace this one too.

[Joshwhite007]

Mine never sets to extreme Temps but often sets to 77 after I've set it to 74 or whatever cooler temp. I'll suddenly notice mid-day that it's too warm or will wake up to too warm because it changed overnight. It's pissing me off and I may buy another brand eventually. I don't think it has to do with being hacked. I think the tofu-fartin hippies at Google think they know better about how to save the environment than we, the customer who paid money for this s#!t, do and they automatically adjust it to a "green" temperature 🙄

[Divamac]

I’m the OP. Still no solution. I’ve had a pro installer look at it multiple times, I’ve replaced the unit twice,I have all learning modes set to off. No auto scheduling.  I’ve put a box over it on the wall. and it still happens. 

[Jeran]

Hey everyone,

Did anyone have any more questions or need any additional help? If not, I'll go ahead and lock up this thread in 24 hours.

Just checking up,
Jeran
 

[Red14Blue16]

No solution but mine continues to randomly jump to 90 degrees. it also automatically creates 90 degree schedules even when ai toggle no auto scheduling. Terrible junk.

[EdwardT]

Hi Red14Blue16,

Thanks for letting us know. I'd love to know more about this. What type of Nest Thermostat do you have? Also, to isolate the issue, could you check the Nest Energy History to see the reason why your Nest Thermostat is changing the temperature? You can click on this link to learn more about this.

Thanks,

Edward

[downes_j]

Yea. Thermostat sucks

[EdwardT]

Hi downes_j,

Thanks for posting. I'm sorry if you feel that way. Could you tell more about what's happening with your Nest Thermostat? What troubleshooting steps have you done so far?

Thanks,

Edward