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expansion tank over flowing!?

i have changed ball valve in the expansion tank but it still over flows cant see any leak from ball valve or hot water coming from boiler anyone got any ideas
gary young, November 2009
had this problem twice in 20 years. the heating coil in the HW tank was ruptured. looks like a new tank required

hewie, December 2009
last time i had that happen it was feeding back through the power shower

b, November 2009