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Do you have a manual or automatic bypass valve? I had a similar problem on my system with a manual bypass valve, i'd actually opened it up to try to fix a similar issue but made the problem worse. I wound it fully closed and then opened it by about 4 turns, that made the radiators get red hot...

Thanks for all the useful info, I guess I have a "no-plan" system :D It looks like as suspected, its just a limitation of the current plumbing, from thinking further about it and looking at Stem's diagrams, the motorized valve just stops the radiators from heating up when the programmer doesn't...

It looks like I might have the "C plan" system that you describe .. Here is a photo of my cylinder: And there is a timer near it, i guess for an immersion heater? On the other side of the wall, there is another cupboard in the bathroom, which contains the following pump and motorized valve:

Thanks for all your replies everyone, i'll get some more photos of the system up when im back home this evening. There is a water tank in the loft, but I can only find the a single motorized valve, if there was only one would this be how it's always supposed to work (heating only with hot...

Hi all I moved into a property approx 18 months ago and i've had a problem with the central heating where the radiators only get hot if the programmer is set to BOTH central heating and hot water. I've been ignoring it for ages while I got more pressing matters sorted but i've finally reached...

Hi all Long time lurker but first post here I've purchased a property built in the 80s which has fairly standard cavity wall construction (my previous experience is on an older single skin brick property which is a little easier to work with for external cable entry) I'm looking to install a...