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Thanks for the prompt reply. What would cause water to come out of the auto-air vent and should I get it replaced?

Hi, I have a ravenheat csi85 t combi boiler which is slowly loosing pressure. When cold the pressure is around 1, when hot it goes up to 2.5. There is a small trickle of water from the pressure relief outflow. There is also a small amount of water coming from the auto-air vent. I assume I need...