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Thanks for you help everyone. The problem is fixed. Hot water is flowing again. Cheers.

Hi Everyone, I'm new to the forum. I have an f22 fault on a Vaillant EcoTech plus 624 combi boiler. I have checked out the posts on this fault and think I have isolated to the problem to de-pressururisation due to the wing nut connections on the filling loop loated on the Unistor tank...