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How do I determine how much to open or close the lockshield valves on my central heating system? Someone suggested that this may solve my pipe banging problem. What is the rule of thumb as they say is it a certain amount of turns. New to this business!! :?

I have recently had a central heating system installed a Ravenheat Combination Boiler with Timer. Natural Gas. Model RSF84E(T) there are 7 rads on the system if all rads are on and I only have two rads upstairs the ones upstairs start to bang and vibrate heavily the only way to stop this is to...