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Apparently while I was out it was seen to flash F23. And we found the paper manual.
That is 'Maximum temperature difference reached between return and flow heating - water circulation fault - check the flow and return heating sensor connection - check the pump speed'
tbc
Mr_Sworld
There's a button with a circle and a line in it. press that for 7 seconds and it should tell you the status of the boiler (error code basically). Press the mode button for 3 seconds to exit that status screen.