NC021 4.7- Nest DoorBell not connecting

[VickeySteed]

Hi Everyone, 

Can anyone shed light on this? We've had a Google Doorbell delivered and it's been a nightmare to install. We've now gotten to the point where the doorbell is wired in with power, our home hub and nest app can both see the camera but not connect. We've been having the error code NC021 4.7 come up, which means the Bluetooth isn't working. But we're stuck from there really- we're reset, re-wired and troubleshot everything else we can. Does it sound like the doorbell is broken, or has we missed something? 

Thank you! 

[Ashepherdson]

From a previous post - If you ever get an NC021 error while setting up and adding your Google Nest Hello Wired Doorbell using the Nest App, you will notice that this is happening at the stage where an existing Google/Nest device (most likely a Google Home Hub) is connecting to the doorbell and it fails showing this error. What you can try is to disconnect (unplug) that device. What's (probably) happening here is that the existing device is handing off your Wi-Fi information and/or credentials to your new doorbell and for some reason it can't. Once the existing device is connected, click on Retry on the Nest App and it will prompt to select the Wi-Fi network and enter your Wi-Fi password...et voila! You should no longer have the error and the new doorbell will be added to your Google Home network.

[EmptyNester]

Just to be clear which doorbell do you have?  The older generation 1 doorbells are called NEST HELLO and they work with the older NEST app.   But your post says you are have the newer nest Doorbell Wired Gen 2 which ONLY works with the Google Home app.