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how can i cure loud banging noises on glow worm ?

how can i cure loud banging noises ,that occur after about 10 mins of starting boiler its a glow worm compact 60, pump is running o.k its about 8 years old.
b.nash, September 2009
banging is generally circulation problem, pump sluggish, blockages etc. pump generally main culprit

ste, September 2009