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Clearing a blockage from a heat exchanger?

My 15HXI heat exchanger is restricted so much that the water will not flow fast enough to allow the boiler to run more than a few minutes. Can anyone tell if it can be cleaned out, instead of having to buy a new one? The boiler is under 5 years old.
Aldo, March 2010
yep i always flush them through with a chemical.

hi-spec plumbing & heating (essex), March 2010