I've just replaced my 10.8Kw Mira with a Gainsborough shower. The Mira has been fine until a couple of weeks ago when it just stopped working (no water coming through). It is on 10mm cable which runs into a new(ish) consumer unit with a 40 amp MCB. It is the second unit as I believed there was a fault with the first one but it is doing exactly the same thing - it will not heat the water. The MCB doesn't trip, the light on the pull switch in the bathroom is lit - all looks fine. Have I just been unlucky or am I missing something obvious here?