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Yes, I should have made that more clear. I posted because I searched a lot and couldn’t find my problem, so thought it might help others in the same situation.

Successful upgrade to Wiser, here are the details in case it helps anyone else. I had a Drayton LP241 which used to control a dual channel system (hot water and central heating). A few years ago I had the boiler replaced with a Glow Worm combi, but did not replace the controller, so the hot...