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    Worcester Bosch Highflow 400 - HW de-pressurises CH

    CH off and HW off. Run the HW tap and the pressure in the CH drops. I have a 2nd problem where the CH is drawing in air to the system. I'm guessing their could be a heat exchanger problem & plan to replace heatexchanged & seals. I'm also suspecting the diverter valve. Any thoughts ...
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