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My Worcester 24CDI boiler is not firing?

I have been told that the heat exchanger is not functioning and needs replacing. Is this so, if so how much?
Ross, November 2013
if we turn the CH temperature
dial to below half and try to run the boiler, the boiler seems to
lockout and the CH light flashes and the

razor, November 2013
link Click here to see other fixes for Worcester.