Your boiler has reached its required temperature and has temporarily paused to prevent it from switching on and off too frequently, which protects the internal components and saves energy.

DIY fix possible

Wait up to 15 minutes for the 'anti-cycling' timer to finish; the boiler will restart automatically.Check that your room thermostat is turned up higher than the current room temperature.Ensure your radiator valves are open to allow the heat to dissipate effectively.