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I don't think so. I don't think there is a problem with an air lock, but I'm not too sure how to check. Nick

Hi First post for me. I have a problem with circulation. My system is a fully pumped vented system with 2 x 2-port valves, 14 rads. The original system was installed some 30 years ago. The boiler was replaced 5 years ago and is a Worcester Bosch Greenstar 30 cdi conventional. All was fine...