i have a baxi 133 he,had some work done recentlyboiler had to be taken off the wall,secured then put back.on refitting the lead to the gas valve was inadvertantly disconnected,the system would then not fire up,on noticing the connector plug was not located properly.proceeded to plug it back in and reset the boiler.the biggest bang ever.i crapped me sel.noticed the burner was damaged,would this account for the banging when trying to start the boiler.thanks.