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Thank you for your help! Picked up a wiring block today and fitted the new controller this morning. Didn't take too long either!

Many thanks for your reply. It's well written and makes a lot of sense! I'll have a second attempt tomorrow while the sun is still up and hopefully before I need heating! Fingers crossed there is enough space in that single gang box too!

Hi, hope you don't mind that this is my first post, but I'm in need of some help! Tried searching the internet far and wide for a solution, and thought I had found one on this forum, but it didn't quite work for me. I'm trying to replace my Potterton EP2002 controller with a Honeywell ST9400C...