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Hello Group, I originally posted this a couple of months ago:- https://www.diynot.com/diy/threads/curious-heating-behaviour-boiler-does-not-fire-up-on-demand.579594/ and I had some degree of success thanks to your kind help. I changed the jumpers on the controller to the correct setting and...

OK, so I recognise that there have been posts on similar issues so apologies in advance if we're going over old ground. I simply cannot get my head around the way my heating is behaving. Quick description of the setup:- Boiler is downstairs, a "Glowworm Ultimate" - old. Installed 80s/90s I...