I recently fitted a rad and needed to solder the pipes due to limited space. I used pre-soldered (yorkshire?) fittings, a blow torch, flux and a heat mat (as advised). All of the joints seem bar one seem fine. The one that isn't good it a tiny leak - I only noticed it 4 days later after the system had been refilled.
How do I fix the (barely leaking) elbow joint? Do I have to drain the system?
How do I fix the (barely leaking) elbow joint? Do I have to drain the system?