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ok thanks for your help. I had a word with a friend of a friend who is a Central heating engineer, and he said it sounds like the diverter valve?

No, it just goes off. The orange light for the fan flickers on then straight off before the boiler fires up initially, but I don't know if this is part of the pre test procedure to allow the boiler to ignite or not?

I have a really weird problem with the above boiler. When you select either hot water only or with central heating, and turn a hot tap on, the boiler will fire up as normal for a minute or two, then suddenly shut off. If you then turn the hot water tap off the boiler will randomly come on...