I've been toying with my central heating for over a week but I've no idea what's wrong with it. Before calling a professional, I really would like to learn a bit or give it a try fixing it!
The heating works for 5 to 10 minutes, the radiators seems to start warming up and there are pipes that gets hot. But after that, it starts to cool down even if I cannot really hear any difference in noise from the pump or from the system.
I've been toying with a couple of valves and I did it without checking their original position too so, I am a bit lost here -- especially what they were supposed to do.
Here are some images of the area I've been toying with:
Valves and the actuator?:
Some pipes going up, left one gets hot when the central heating works and cold when it stops working: