Nest thermostat

[Lascellesdunkle]

Just installed nest gen 3 everything worked after 3 days don’t work showing code E74

[Zouf]

There’s a troubleshooting guide for those codes on the Google support page. 

[Jenelyn_O]

Hi there,

@Lascellesdunkle, I saw your post and wanted to chime in — I'd love to help.

The Nest Thermostat will give you that E74  if it detects that there's no power to your RH wire. Mostly, it can happen if you encounter a power outage in your area. Make sure that the breaker is on and you receive power to your home. Also, you can check if the RH wire is properly inserted in its terminal. 

You can check this article  for additional  troubleshooting and let me know hot it goes.

Thank you for your help @Zouf and @eveluna

Regards,

Jenelyn

[Anonymous]

Refer to this link: https://support.google.com/googlenest/answer/9240096?hl=en
Also, try to restart all your thermostats or check the wires voltage with a voltmeter.

[Jenelyn_O]

Hi Lascellesdunkle,

I wanted to follow up and see if you still need help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Best,

Jenelyn

[Jenelyn_O]

Hi Lascellesdunkle,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Best,

Jenelyn