Your boiler has been turned off by an external device, such as a smart thermostat or a specialized timer, that is currently telling the boiler to stay disabled.

DIY fix possible

Check your smart thermostat or external timer settings to ensure no 'Away' or 'Holiday' mode is active.Verify that any external wiring control device is powered on and communicating correctly with the boiler.Try power cycling the boiler by turning it off at the fused spur for 60 seconds and turning it back on.