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My central heating system is very noisy?

I have a combi boiler which is about 5 years old. When the heating comes on, I get a lot of clunking and clicking noises. I have tried bleeding the radiators but it hasn't helped. Can anyone tell me what to do please. It's so noisy it's waking me up at night.
Jo, December 2011
look like heatexchanger is blocked need power flush and new pump,replace new pump see if works

ltd, December 2011