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how can i fix my ravenheat condensing combination boiler csi 120n(t)low nox?

i have a ravenheat condensing combination boiler when central heating is about to switch off theres a loud vibrating noise and i don`t know whats wrong with it and i have to switch it off manually .can anyone help . I want to know whats wrong with it thanks

mr patrick masons
February 2010
RavenheatHeating, Home Heating SystemsCombination Central Heating
had this problem when hot water flow was reduced it was the gas valve, ravenheat replaced it under warranty been ok since

ds
March 2010

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