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Thanks for the advice. Just to confirm - the boiler pressure is at 1.5-2 bar when cold but drops when either the hot water or central heating is run to zero. I would expect this to work the other way round - any ideas what is causing this?

We have a Vokera Excel 80SP and over the last 3-4 months, the boiler has started making noises mainly when the hot water tap is run. It sounds like a loud rattling/banging. It does it for about 5-10 seconds when the hot water is run for the first time for a while. After this, its fine for a...