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Worcester bosch CDI Hot water fault!?

The central heating works ok. When you demand for hot water the burner keep going on and off like every 10 seconds.

Can anyone help?
SW2 plumber, December 2007
could be blockage to chlorifier or diverter playing up.

b, January 2009
Found the fault, DHW heat exchanger sludged up know working 100%

SW2 Plumber, December 2007
link Click here to see other fixes for Worcester.