knocking and huming from hot water


Postby grizz » Mon Mar 03, 2008 12:01 pm

When my boiler is on and i turn on any hot tap the pipes make a knocking sound followed by a hum before the noise stops. this may happen a couple of times a day but not all the time. i think its a valve problem but which one (if any) i have a pressurised system with a pressure vessel by the hot water tank and another type of pressure vessel in the loft.
please help
grizz
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