not working Nest Hello
two devices were installed and working then after two weeks not working and not even a light .
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If your situation is similar to mine, I had a power cut (power outage) that happened when the outdoor temperature was below freezing. As a result my Nest Hello (Gen 1) wired doorbell never rebooted when power was restored. Solution: Disconnect it, bring it inside, power it up on USB (leave it alone for about 30 minutes to heatback up to room-temperature). Then reinstall it (quickly) while back outside. It's now happily wired-back and online.
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This is confusing - a wired doorbell has to be charged/powered up on USB? Why even bother with a wired power connection then?
@Tammy Russel: The wired doorbell contains a battery which performs increasingly less effective the lower the temperature. Additionally, there seems to be a low-power resistor film that generates heat. When conditions are most extreme, older devices struggle more and certain situations like a power cut during said extreme conditions are too much for the battery to work and also overwhelm the resistor. This requires the device being brought back to more room temperature conditions to recover in a sense, during that time the USB is just the kick it needs to get back into it. Hope this helps explain it a bit better.
