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the pump is running,radiators getting hot.Every thing seems to be working as normal apart from the banging and boiling.

normal working pressure is 1.5 bar.

I currently have a vokera excel 80sp combi boiler.Just recently the boiler has started to bang and boil the water in the heat exchanger.The boiler is 7 years old.The safety stat is working and shutting down the burners.It does this both with the hot water tap and central heating.What also occurs...