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Hi David, I haven't been up to check the header tank but the system is definitely full of water. I've did try bleeding all the radiators and the pump to check this and they were all fine. Also tried the thumb valves and they are also free of air. There is also a bit of a whooshing noise around...

Hi guys, for the last few days CH system has been playing up. The heating comes on fine, but after a while the downstairs radiators cool down. I thought the actuator on the 3 port valve may be at fault but I have fully tested it today and it seems fine. Also removed the motor box and tried...