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Why does my Worcester bosch 240 have to be reset after 3 mins?

My worcester bosch 240 combi has to have the little red reset button pressed after we run the shower for about 3 mins anyone know why?
Graham Whiteoak, July 2008
usually its the plate heat exchanger blocked up or divirter valve

itsy333, July 2008
link Click here to see other fixes for Worcester.