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loud thump several minutes after shutdown?

worcester 24i combi RSF .boiler is working fine, but after shutdown and about 5 minutes after the heat dissipation phase has finished, a loud disturbing thump is heard! any ideas?
pete in paignton, October 2008
I have the same problem when I turn mime on, stops after about 10/15 mins then starts up again. Thought it was air in system so bleed all the rads & topped the water up as noticed it was lower than norm, none of which have solved the problem.

cfwar25, December 2008
link Click here to see other fixes for Worcester 24i.