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I've topped up the boiler this morning at 6am and tied a bag over the PRV vent outside- having re-filled the boiler again at 2.30pm (it was totally empty) the bag is completely dry :( I'll ask the plumber to check the auto air vent. Thanks for your help!

greetings all I can see that many people are having probs with having to top up their Vaillant boilers. Mine is 18months old & didn't need topping up for a year - since then, top-ups have been required more & more frequently - to the point where I've topped it up twice in 3 days as it has...