https://www.googlenestcommunity.com/t5/Nest-Protect/CO-detector-off-line/m-p/107041#M2365 <P>One of 3&nbsp; five week old CO detectors all of which passed automatic test including WI-FI link 17 hours ago now alerts "off line". Following every step suggested on the App has yielded no resolution. What do you suggest? If I could reach the manufacturer&nbsp; I would request an authorized return /replacement, but that seems to be a very well hidden option</P> Wed, 16 Feb 2022 19:35:47 GMT rlsanch 2022-02-16T19:35:47Z https://www.googlenestcommunity.com/t5/Nest-Protect/CO-detector-off-line/m-p/107041#M2365 <P>One of 3&nbsp; five week old CO detectors all of which passed automatic test including WI-FI link 17 hours ago now alerts "off line". Following every step suggested on the App has yielded no resolution. What do you suggest? If I could reach the manufacturer&nbsp; I would request an authorized return /replacement, but that seems to be a very well hidden option</P> Wed, 16 Feb 2022 19:35:47 GMT https://www.googlenestcommunity.com/t5/Nest-Protect/CO-detector-off-line/m-p/107041#M2365 rlsanch 2022-02-16T19:35:47Z