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Thanks for the reply Jadnashua. It's not a pressurised system, I think it's what's called open-vented, and has an indirect hot-water cylinder. What's confusing me is where the water is coming from if the boiler isn't turning on, I can't trace where the pipe is coming from, but I suspect it's...

Hi all, new here and looking for help as you might have guessed ! Here's the problem. Just before Christmas I noticed my oil boiler was making an unusual whining sound, plus it was no longer heating up the hot-water cylinder, and putting on the immersion only heated up the top five inches or...