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Hi Kevplumb, Many thanks for the reply. Yes the thermo valve was replaced like for like, it doesn't appear to have an arrow on the body. Mylo

I have an outdoor combi boiler which is three years old (oil fired). When the heating is switched on (more so from cold) there is a really bad banging from what appears to be the second radiator in the line. As this is in a bedroom it wakes most of the house up !! It sounds like it comes from...