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Yes, it does! but thanks for all the answers. I will give them a call....

Thanks, yes missing wire now installed but If I+P are set, the timer works but setting 'CH only' illuminates the HW light too. Guess as previously suggested it depends on the sequencing.

Does this affect the control of it?

Yep, that is how it is! Very clear diagram

All I can see from the manual and plate is it is a Glow worm Space saver 52. House built 1982.

Terminal 4 of the wiring centre above.

Thanks for your help. I connected the HW OFF up to terminal 4, but still no success, even when I manually connect L to terminals 1 and 4 of the programmer. However, the when the jumpers on the back of the programmer are set to L+P and programmer is set to CH only, the HW comes on when below...

Ahh, yes, I get that. Thanks edit: It still won't work on the Pumped, linked setting HW only mode.

Thanks, I will have to give it another go then... Any idea why the programmer wont operate on the pumped setting? That seems really weird to me...

Is there a standard way (order) to configure the wiring centre? Also the DST setting on the programmer will not advance the clock time forward one hour when set. Why is this?

1 Brown Boiler L 2 Black Boiler N 3 not connected 4 not connected 5 Yellow Programmer HW ON 6 Yellow Room Thermostat (calling) 7 Red Programmer CH ON Red Room Thermostat 8 Green/ Yellow Boiler E 1 2 3 4 5 6 7 8 1 Brown Pump...

Hi I have a glow worm space saver 52 with a British gas UP2 (Drayton LP722) programmer, a Grundfos pump and a Drayton mid position valve. Fully pumped system. Looks like a standard Y plan arrangement but no connection to the HW off terminal on the programmer. When I (hard wired) connected one...