Hortsmann H27XL to Drayton MiGenie Wish 2

Surely the cable I've starred is the room stat as it's the only one going to the white of the 3 port valve! blue neutral yellow live to stat from programmer red switched live. You need to remove that cable and put a wire link between where the red wire and yellow wires came out. If you disconnect the cable you have marked you will be left with a live end!

The cable marked appears to be red to fire boiler yellow for pump controlled by boiler and blue neutral
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Thanks Echo! Luckily, I haven't had time to make the changes today as the family has had the heating on.

I will give it a go tomorrow.
 
Thanks Guys! Just to let you know that I followed your advice and the system is now fully functional!

Many thanks!
 
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