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So the system is now working again. I seem to have resolved it by accident. Was looking for a way of getting the actuator off and got hold off what i thought was the clip to release it from the valve. Turns out it was part of the actual switch and by pushing it firmly it seemed to re-engage with...

Thanks for your replies. I have tried freeing this off by spraying the mechanism with WD and working it in and out whilst the little man turned it on and off. Was getting a bit freer but then the little plastic handle bust off! However if i can get the actuator off, i will probably be able to...

The 2 port valve is sticking a bit open and hardly moves when heating is switched on. The only way to get the central heating to switch off is to kill the power. Due to the obvious defect I can see with the 2 port valve, I think this is causing the issue. Would anyone tend to agree or disagree...