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Thanks for the reply Softus. The noise is in all the radiators not just the ones with TVRs. I'm pretty certain there isn't a speed setting on the pump as I have asked if the speed setting could be altered and was told no. I think you're probably right about sludge in the system but I can't...

Hi, please can anyone offer any advice. Earlier this year I moved into a council flat with a Worcester Heatslave 9.24 combi boiler which was installed in 1988. There are 6 radiators (2 with thermostatic radiator valves). The problem is all the radiators make a constant noise (like wind...