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A few months ago the diverter valve went on my boiler and just the diaphragm was replaced. Since it was done, the boiler was losing pressure and dripping slightly underneath and the chap just never came back despite several calls and eventually just ignored my calls!! Needless to say I'm not...

I have the above boiler, which was installed in October 2000 (before I bought the house). It is now refusing to heat the water at all. There are no flashing lights to indicate where the problem might be. The central heating works fine, the pressure is ok (about 2 bar). When I turn on a hot...