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I live in an old guest house and I was decorating a room and I removed a smoke detector and the plastic base fell to bits so I bought a new smoke detector to replace the old one. My question is what to the four wires correspond to? And where would they go in the new smoke detector base plate...

I’ve succesfully connected the nest heat link and set up the nest thermostat. I am able to turn the heating off and on without an issue. I have the room temperature in my living room set to 20c just for a trial. It’s currently at 17c and the app is saying it will take 45 mins to go up 3’c. Does...