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glow worm 50ff boiler makes noises once fired up?

I have a glow worm micron 50ff it fires up ok but when once boiler has been on for a while it makes banging noises and sounds like water being dumped/scapping noise, more so when heating reached its temp and boiler cuts out, any idea's what this could be
dammad, January 2013
check pump and airlocks

kash, January 2013