The Nest Community is now Google Home & Nest!
We have moved to a new home. Please visit the Google Home & Nest Community to connect with other users, ask questions, and explore the new space.
I just had my Nest reinstalled after a home renovation and was receiving
the E78 error. Turns out the HVAC guys mounted it using screws with
rounded heads. The rounded heads prevented the Nest from fully
connecting together. They also prevented one o...