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combi boiler making clunking noises?

hot water start to run cold on inspection can hear clunking and scraping noises inside boiler plus water pressure gage bouncing all over
welly, May 2012
most likely circulation pump blocked or failed

tony, May 2012
what make & model boiler do you have?
gas council number? 47-???-??
NO DHW?
does the CH work OK?
are do you get the same clunking noises when CH ON?
can you hear/feel the pump running?

manwithnoname, May 2012