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No, this is in a new single storey extension that we had built (structure and first fix). There were the two 15mm plastic pipes loose by the main flow and return pipes and the other ends emerging from the wall under the window. The pipes run from one side of the room to the other in the...

Yep, that's correct. I could remove the TRV and lockshield from the pipes and the only water escaping would be from the radiator. I have considered a blocked pipe, but why would it heat up sometimes and not at other times and also, surely both the supply and return pipes are pressurised and...

did you crack the joints before the trv/locksheild or after them ? I cracked the joints on both sides of both valves. i.e. pipe / TRV joint and then the TRV / rad joint, then the same with the lockshield valve joints.

Hi, I could really do with some help with a new radiator that I fitted a few weeks ago. The system is a sealed system with a combi boiler and the pressure guage works fine. The radiator is now the first in the system. When I first connected up the radiator and re filled the system...