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The system as-was had the programmer and room stat wired directly in series, so nothing has changed in that respect with the introduction of the Hive. The boiler is definitely a pump overrun type, I had a look in the manual online and the wiring diagram makes that clear; connecting the pump to...

You're welcome and well done. Good luck in figuring out how the rest of your system works!

Yes, my diagram will give you exactly what you have now. However I would be interested to see what the cylinder cupboard is like. Based on your description of the hot water timing I suspect you'll find the yellow wire from your block 2 goes to the cylinder stat, and from there to (hopefully) a...

[Edit: I mistakenly carried over the TimeGuard labelling. For NO1 read Hive terminal 4, and for NO2 read terminal 3]. Wiring it like this will replicate your existing functionality, but will not enable use of the second Hive channel for separate hot water control. You'll need to work out...

Miscellaneous

Wiring diagram to answer question

I found the manual for your boiler online and the wiring diagram in it helps to explain things a bit, you might want to take a look. First thing to say is that your system diagram doesn't show where the live supply could be coming from. You'll need to work that out so you can sure you've...