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Vokera combi- flashing 04?

Came home to find no hot water or central heating, light and error code 04 flashing. Appear to have no pressure. I believe I should turn the tap of the tube - filling tube? - to adjust pressure, but cannot budge it. Is there a special adaptor or do I need to get a friend with more welly?

CeciliaD
November 2009

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