Central Heating only working when hot water is running?

[Joseph lewis]

I'm working on a Halstead Eden CBX32 and it only seems to run when the hot water is running. I've removed the diverter valve and the valve motorised head, but as I'm new to this I'm. Not sure of the best way to go about testing to see what's faulty... I can't seem to get the valve head to retract. It just keeps pushing the arm out... also to be noted is the pressure vessel is full of water, but I can't see how that would mess the system up in this way? Any help would be much appreciated.

 

[Chalked]

Hi can you pm a moderator with you gas safe info. Then this can be answered out of the public eye.

 

[ShaunCorbs]

@Lou

 

[Lou]

If you send your gsr number I can move this to the correct forum.