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Thanks for the quick reply. As long as I turn off the mains supply and open the taps to relieve the pressure first, is it a simple case of replacing the faulty valve like for like?

Hi My boiler is working fine re. heating the hot water but as the pressure has dropped on the closed central heating circuit we have no heating. The boiler has an external metal hose loop fitted for re-pressurisng but when I open the two valves (the double check valve with isolator on...