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Thank you for your reply. It was an airlock...I managed to clear it by bleeding all points and switching the pump to full. Regards Russell.

Hope you can help me. I have a gravity fed central heating system which I have drained to permanantly remove a radiator and pipework to it. I have capped the pipes and re-filled the system but now have no hot water or heating. I have bled the system through all remaining radiators but I am...