I have had on and off issues with my central heating, and had my plate heat exchanger cleaned in the past so decided to do it myself as the hot water was not constant. So I took it off cleaned it, and now the Hot Water works but the central heating fires up but straight away has flame failure. I drained the system and the refillesd it so I think its probably something simple to do with pressure, but I have no idea to be honest. everything I have read normally suggests both would be off so seems a little odd hot water works. any ideas pleaae?
