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I'm hoping someone can help advise me about my Potterton Suprima on an open vented system that is making a steaming noise whilst it is running. The noise originates in the boiler but can be heard through most of the other radiators in the system. The boiler used to run quietly until earlier...

When it is raining I am seeing some dampness on the surface of the chimney in the loft. I've circled the problem areas in the picture below. These areas are damp to the touch and some moisture is visible (it seems to be running down the white marks). The blue arrow shows where I can see a...