@Muesli Half a degree doesn't seem at all unusual. Does it move an higher than that?
@Mansell Does it stay that far out or go to 22.7 and then flatten out?
@Mansell I've seen images on here - try copy and paste?
I am not sure if this April 2019 post by support is still extant but it may help understand these issues.
I think there are a few misunderstandings that I wish to address here.
I swapped batteries and reset the button for three seconds. The thermostat is showing a spanner symbol. App says it has connected to the server but above continue installation it says device not mounted in red?