Hello folks, recently I've been having an issue with my boiler, there's this little white box near the boiler, as you can see from the pic attached, once every couple of days or so the light under the green one goes red (the green one going off) it basically shuts off the heating and any hot water until I restart it from the mains and there is no error on the boiler's screen, it just shows zero, thank you for any advice.