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Hi there D_Hailsham. I'm not sure as to whether it comes from the ST9001A Programmer unit or direct from the boiler power supply. I am the tenant not an engineer so I have posted a pic to enlighten you. Hope it is of use. Thanks. http://www.diynot.com/network/Taffy45/albums/

Diagram:

Hi. I'm having trouble with central heating. Potterton Promax Combi 28 HE A. Honeywell ST9001A Programmer. Honeywell R6660D Roomstat RF receiver. Honeywell HCW80 Roomstat RF sender. Heating failed. Tried doing what i'm expected to fix, but to no avail. The binding will not make any...