This morning the heating was registered as on but the temperature in all rooms was not increasing. I didn't notice. When I got up I noticed that the temp was low in all rooms. I checked the app and the Care and Protect part of the app registered that all valves were running at 100% but temp was not rising. On the Wireless Receiver there was an error showing up. After about 2 minutes the issue went away and began heating the house. Unsure why.
When issues like this appear it would be useful to have a push notification to say that the temp isn't rising but boiler is on. This was I could have investigated quickly rather than getting up to a cold house.
You can see by the temp graph below that once the issue was resolved the temp rapidly increases.