e72 error despite wires being clean and voltage coming through

[Stef]

Hi! I am in the US. A few days ago, we turned our Nest Learning Thermostat on after several months of not using it. It worked well for a couple of hours and suddenly stopped, and displayed the E72 error message. Wires are clean (see picture attached). I tested for voltage at wires (RC and G, RH and G) and power is coming through (26-27V). Does someone know what may be the problem and how to fix it?

Attached a few more pictures of our system.

Thanks for your help!

Stef

[Jake]

Hey Stef,

Apologies for the late response. I wanted to follow up and ensure you are good to go. Please let me know if you are still running into the error, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[Jake]

Hey Stef,

I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity. 

Best regards,
Jake

[GarrettDS]

Hey folks,
It looks like we haven't heard back from the OP so I'm going to go ahead and lock the thread. If you have any further questions or concerns, feel free to create a new thread.

Have a great day,
Garrett DS