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I see what you're saying but now I'm thinking this has got to be a fault with the valve itself rather than the actuator as I've physically shut the valve tight using pliers with the actuator removed and hot water is flowing through the valve. If the pump was forcing the valve open presumably I...

I've removed the CH actuator then switched the HW on and observed the motorised drive socket inside rotating which looks OK. The valve itself does seem slightly stiff, I can't turn it with my fingers but can easily turn it with pliers. I've turned it tight shut with pliers, left the actuator...

Just got chance to log on. Thanks for the advice. I'm on with it now.

How do I prove the CH zone valve actuator is faulty (i.e allowing a flow when it should be shut) ,other than replacing it? . If I do replace the valve do I need to swap the whole in line compression fitting as well as the motorised valve or does it come as one unit? Any advice is much...

system is 5yrs old. Set up as twin zone (s)plan with dual drayton Zone valve actuators (ZA5\\\'s). Problem is CH comes on when HW on but not vice versa.Checked programmer is working ok and actuators click and whir like they are working. HW anf CH should run independantly.Could this be a fault...