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biasi spa 24s jr combi runs hot & cold?

hi,i have a biasi spa 24s jr combi boiler which is 10 yrs old
& has a problem with hot water,heating works fine but burner fluctuates when on hot water! any ideas? cheers sue x
sue, May 2011
the heat exchanger is blocked

A1, May 2011
link Click here to see other fixes for biasi 24s jr combi.