Knocking sound in central heating system
Funny enough I'm having a similar problem.
I had 90% of my central heating system re-plumbed recently, the other
10% was replaced a couple of years ago. When the Boiler starts up I
hear a tinkering from some of the valves, it something to do with the
flow of water - turning the valve down reduces the noise. I haven't had
some time to investigate.
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