N
never-in-doubt
Ahh thanks, maybe this is what happened with ours cos when you turn the spur off the whole boiler did used to turn off.....Your boiler is supposed to have a permanent mains connection. Just some did wire them so the boiler gets only mains power if there is a demand. This stresses the PCB/boiler a lot and can lead at a faulty valve already to a total black out of the system.
But not to worry, you should be in good hands now.
Good hands, with homeserve lol. Maybe not, but hey - its free for a diagnosis if anything I guess 🙂