Your boiler is currently showing the live temperature reading of the 'warm start' sensor, which keeps a small amount of water pre-heated for faster hot water delivery.

DIY fix possible

Check if the 'Comfort' or 'Warm Start' knob is turned on.Wait a few moments to see if the display changes back to the system pressure or main temperature.If the code persists without the boiler firing, try a simple reset using the flame/cross button.