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I have an underfloor heating system in my house on both the ground floor and the first floor. The ground floor manifold operates fine but I have a problem with the first floor manifold. If the heating is on downstairs but off upstairs then the return gauge on the upstairs manifold goes up to...

Hi everyone first post here. I have an EA122 valve which leaks from the red cap despite the main body being turned to the closed position. I have read that you can open the top of these vents to clean them out but I can't seem to open mine. Any thoughts or suggestions would be most welcome...