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The system has two seperate pump for the CH and DHW, no diverter valve is fitted. The only item I have not inspected is the one way valves fitted to each pump. However these has small test plungers that you can press - seem OK. I will remove the water/water heat exchanger again today and see if...

My Worcester Bosch Boiler shuts down on overtemp when the DHW is required. The Boiler works fine on CH. When the hot water tap is opened the boilers starts fine and then boiling inside the boiler can be heard after approx 5-10seconds. The boiler then shuts down (thermo stat trip on boiler). I...