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Thats the one. Couldnt find vents in high level pipe. Going to drain down again and put some in see if i can get it going! Thanks

Pump appeared to be working but i didnt check for voltage. Possibly naively i assumed everything should be working as there were no problems before i drained. Didnt see any motorized valve however it may be hidden. Couldnt understand the heating vs cylinder coil? and had a thermostatic valve on...

Hi recently drained central heating system to add radiator. Refilled - bled rads, pump and various vents in airing cuboard. Fired boiler but after a minute there was a banging sound from boiler/flow return pipes? then overheat light comes on and boiler cuts out. Heat seems to go partially up...