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worcester greenstar 12i/24i system boiler?

my boiler intermittently 'bangs' I think on ignition. but not every time. had an engineer look at it yesterday, but i heard it again this morning. i know he changed some parts yesterday but it obviously hasn't solved the problem.
maureen hove, April 2009
system pressure gauge reads 0 bar how can I fix it and what is the cause

brian, May 2011
link Click here to see other fixes for Worcester Greenstar.