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found the live from the fuse spur was loose fixed it but problem persisted, I then tried a tempory connection to another stat a bingo it worked on heating, I thought Id cured the problem but when I wired and mounted the stat problem re-occurred, I went back to a tempory fix but problem still...

no just a connector block connecting live and neutral from the programmer and boiler stat to the gas valve

I have a control problem with a thorn m34 pumped ch gravity hw. when the programmer is switched to hw water boiler fires up but when control switched to heating boiler tries to fire but goes off instantly, switched stat to call for heat pump runs but does not fire. changed stat and programmer...