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Hi, My combi has started shaking intermittently during the recent stormy weather almost as if air pressure is getting trapped in through the flue somehow.(sounds a little like a washing machine on spin in the next room) If I turn the thermostat down, it stops and then runs normally when I turn...

There is a valve connected between the outflow and return pipes just under my combi boiler. What is this for and should it be open or closed?