The same thing happened to my boiler this morning (same make/model). It sounded like a kettle boiling and then the almighty bang woke the house up! Initially, I thought the boiler had frozen overnight due to the extremely low temperature out side, but when I reset the system I heard the pump kick in. The first thing I did was bleed the system of air - but I need to keep an eye on the pump.
Koola
November 2005
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