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Hi all The radiator is leaking from both (i think...) joints in the photo. This only happens when the heating is off, or the radiator is off. Then after time this results in a loss of water pressure on the boiler. My question is.. what do the 2 screws in the photo do? I can tighten them about...

Hi I have low water pressure on Vaillant Turbotec pro. I can't find the manual anywhere and I can't figure out what to do. What should I turn exactly?