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How can I fix my boiler?

I have a Worchester 24CDI RSF combination boiler and the burner is triping if I do not keep the water flow at maximum.
Hence the hot water flow is not continous.
The central heating side seems OK.
Anybody available to comment ?

Thanks
Annita, May 2008
scaled sludged heat exchanger for dhw. overheat cutting in unless you have water full pelt to get heat away.

iain, May 2008
Flow switch or turbine not operating or scaled, needing full water flow to fire boiler.

T, May 2008