I have a nest learning thermostat which has been working ok* for a year and a half, and suddenly stopped turning the boiler on. The boiler is fine, I tried alternative wirings. Nothing works. The nest "looks" fine: turns orange when setting the temperature higher than the current temp etc.
Any ideas? I'm pretty sure it's an issue with the Nest itself.
(*) Temperature control was fine, WiFi connected according to the nest, but "offline" from the app most of the time.
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