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Stem. Thanks for that will try it again when I get in from work

Hi all new to site looking for advice. Horstmann centaur plus c27 gave up the goast late evening. So nip to shop got a Drayton LP522. Have a gravity feed system 2 X 2 port valves and pump. Boiler has no switch live. Pictures show the way my control box is wired up. And a picture shows back...