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Thanks for the tips chaps, I believe I found the problem, with CH on at the programmer, there is no power to pin 1 of the room thermostat, I also can't hear the relay in the programmer clicking for CH, although it's fine on HW, so I am guessing a faulty ST6400c. Cheers!

Hello, I have a Potterton Suprima 70, the hotwater works fine on the programmer, and if hit "override" or "+ 1 hour", unfortunately the CH doesn't. With the HW off, the CH timer and manual buttons have no effect, the red light comes on the timer as "CH on" but no activity on the boiler or pump...