danfoss motorised valve hsa3

[MZR]

hi all

been called to a gloworm ultimate 60ff today with a danfoss hsa3 motorised valve, the hot water works fine the heating when called for the stat says its on but the valve is not moving if i put it on manual then it all works fine but the stat wont switch it off untill the valve is moved from manual, ive checked the wiring and found this blue wire from the valve not connected i have no idea where it goes and carnt find the pdf online for the valve i have attached a picture any help would be great

the blue wire has red tape on it

 

[Atouchofgas]

http://docs-europe.electrocomponents.com/webdocs/007b/0900766b8007b1c2.pdf
Blue should be neutral

 

[Spiritof'76]

Can't have ever worked lol