We have an old system with a header tank in the loft. Over the last few days I have bled the radiators many times. However one section:
- Took a few hours until any water got to it,
- Its radiators were then filled with air (I bled them again at this point)
- The next few times the system was turned on, this section heated up as quickly as the rest of the system.
- Now this section is not heating up (I think due to an air lock)
I can’t see any leaks, whenever the pump starts up for the first half an hour the system make a lot of noise. What do I need to do?
Closing the valves on the all other radiators, got hot water to the section that was not heating up, but how do we stop this happening again?