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Hi all, fitted a new rad on the ground floor of a small house with a worser bodge combi. Pipe work running from the room above. There was already a loose board upstairs which I lifted and teed into "flow & return", filled up and everything was pretty as a picture until I fired her up... No heat...

Help, I have a problem getting gravity circulation going through an indirect cylinder. Rayburn LPG, pumped central heating with check valve on CH flow and pump on return, f&e feed taps into top of return at cylinder, expansion into top of flow at cylinder. Have tried to kettle system, back fill...