That's fantastic - worked like a dream - problem solved!
So simple, yet this had baffled the manufacturer of valve, manufacturer of stat, guy who fitted it, and me ...
I'm very grateful.
Cheers.
My plumber and (not very experienced) electrician friend have fitted a Drayton ZA5 Zone Valve Actuator and center ehe0200155 room thermostat to control a single radiator zone.
However in order to switch the rad on you have to turn the thermostat down, and conversely to switch the rad off the...