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Many thanks - I am an idiot!! The l shaped key was not contacting one of the valves properly as there was some gunge in it! It is now filling!! Many thanks for your help! Nick

Yes I am filling it right - have checked in the book! Is there any other stop to this valve somewhere??

Hi All! I have a Valliant turbomax Combi boiler, which is reg serviced. The pressure is dropping to near zero. I have tried to fill it with the key to let water from mains into the system.... this usually makes a whooshing noise. Unfortunatley the whoosh has stopped and so I believe the...