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how can i fix my worcester bosch combi boiler?

My worcester bosch combi boiler will not give hot water when selected for hot water only,yet when I switch it to central heating and water,it works normally.why is this?
garry smith, April 2009
There is a diverter valve inside your boiler which provides this very function, and I guess its faulty. Not uncommon.

John, April 2009
link Click here to see other fixes for Worcester.