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how do I stop my worcester bosch boiler banging?

Ive had a boiler installed and added radiators myself, after the heatings been on awhile it starts banging.
The boilers a worcester bosch 28i
Peter Clews, April 2008
When you installed the new rads, did you
a) flush the system?
b) add inhibitor when you refilled it?
c) add silencer when you refilled it?
d) bleed out all the air when you refilled it?

T, April 2008
link Click here to see other fixes for Worcester Bosch 28i.