I'm having trouble with hot water, it doesn't heat up when the radiators aren't on we have to switch it on when normally the hot water worked without doing that, but even then the tap could be on full temp and still only warm so it's annoying when trying to bath the little girls. I've read allot about the DHW sensor could it be this and if so could I do it myself as a pure novice?

Kieron, February 2011