Clicking/cracking heating pipes


Hi, Since a long(ish) time with little use through summer, our heating pipes have now started to make expansion type noises - when they didn't before. They are rather loud, annoying and worrying. Worse still, they are not settling down or getting any better now the house has started to warm through again. Has anyone any suggestion on a fix or places to look. Here's what I know, so far:- Gas boiler, fan assisted type heating hot water and central heating. Boiler itself seems to be behaving normally. In the region of 12 years old. Turning off each radiator in turn (or sometimes 2-3 at a time) makes no difference; Altering the pump speed (really very slow, slow, medium (supposedly fast)) makes no difference; Changing the boiler temp switch (high,low) makes no difference - we have always run this on low as high makes to rads a bit too hot for the children (and us); The sound/s seem to be both expansion and contraction and I expect they are from the main boiler heated outlet to the tank but noisy from under the upstairs floor and heard along three points (one of which is not a boiler to cylinder route). I can't see anything a miss with the pipework at the HW cylinder nor around the pump/three way valve etc that sits below it - the noise is not coming from this area at all. Christmas and all, I'll check back when I can if anyone can think of a 'next step'.
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water hammer if its banging, but if its just creaking thn, not major, find the creaking spots and loosen the pinch points or put a bit of cloth on the pie where its rubbing.
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