Hi I have a nest thermostat, hard wired, to my combi boiler.
The thermostat is placed in the ground floor hallway, away from any direct sunlight.
Recently the thermostat temp is showing as 22.5 degrees, and it has not change during the night when it's colder or during the day.
This obviously means the reading is incorrect, e.g. it is more than likely 17 degrees in the hallway but the thermostat still reads 22.5.
I have done a factory reset but still not resolved.
I wanted to follow up and see if I could be of any help. I found an article that could be of help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.