I have recently installed 12the new convector radiators to a new extension. I have taken away 2 old radiators and used the existing pipework as my new feed to the radiators on a flow and return system. After testing the radiators the nearest 3 were very hot the next 7 were warm and the last 2 nothing. I bled the system from the drain cock and hot water started to come in to the pipe but then went cold again and the last one didnt get warm at all can you help.
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