I have one Nest connect smoke detector that hast never worked. It was installed about 4 months ago in an detached garage. I got messages that batteries needed replacement and then that the sensor needed cleaning, both of which I took care of but now it says the sensor has failed. I contacted someone ( maybe your?) but was only able to go so far because I was not on site with the detector. That was a couple of weeks ago and Now I can’t figure out how to get ahold of them again
I am onsite now and have the detector handy
Sounds like you have had quite the ordeal, sorry to hear about that. You can use the link, here, to get back in touch with support over the phone. Please let me know if you have any trouble getting in touch with our Team.