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BANG!!?

When my central heating boiler shuts off i can hear a loud bang from somewhere but cant pin-point it. what is it??
Phil, February 2010
make sure the pump keeps running after the boiler stops firing, it should continue to overrun for approx 2 mins, if this is happening make sure the system has a bypass as banging can be heat unable to get away from the boiler, try boiler noise silencer in your f and e tank but if you can get it straight into the primary pipe work it would be more effec tive

john, February 2010