Your boiler is currently performing an internal health check on its sensors and has temporarily paused heating and hot water to ensure everything is functioning safely.

DIY fix possible

Wait for the boiler to complete the automatic test cycle (usually takes a few minutes).Monitor the display to see if the boiler returns to a normal status code (e.g., S.0 or S.4).If the code persists for over 15 minutes, try a manual reset via the button with the flame symbol.