T04 error -

[monique21]

is T04 error a thermostat issue or is a furnace malfunction?

[sporfrog]

Hopefully this will help:

Troubleshoot Nest thermostat T error codes

[monique21]

Thank you, I saw this but I'm trying to understand if this error means that furnace has a malfunction or the thermostat?

[MelbaDT]

Hey folks, 

Thanks for answering and for providing the link, sporfrog. 

monique21, this specific code means that there maybe an issue with your system or that the Nest thermostat is not properly setup. In these cases, it is still best to contact a local pro to help you get your Nest thermostat connected to your system and set up correctly and of course to ensure that your HVAC system is working as it should. 

Best, 

Melba

[MelbaDT]

Hey there, 

Checking back in — how's everything going on here? Still have some questions about your Nest thermostat?

Best, 

Melba

[MelbaDT]

Hi, 

I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. Should you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.
 

Best, 

Melba