I think it is the actuator and the valve , I loosened the valve off as it was a bit stiff but the actuator is struggling. It is now operating as it should just slow to react . New valve and actuator on order .
Thanks for your help
It’s an oil combi camray 5 ,
I’m starting to think I may have the wrong hive receiver should have a single where I have a dual . Doesn’t explain why it has been working until now though
I installed a new hive system a couple of months ago as the old programmer started to give problems , all was working well until yesterday.
The central heating seems to be constantly on .
Would this be down to a stuck valve or something else ?