Just moved house. My conventional open vented heating system has the pump on a vertical pipe just below the boiler.
I drained down to replace a couple of radiators. When I refilled, I bled the Grundfoss pump. I have never bled a pump before, and when I loosened and removed the bleed screw, I expected to hear a bit of air escaping like the radiators, followed by a small jet of water.
All I got was a slow drip (with the screw removed), about a small drop of water every 15 seconds or so. Is this normal, or is there a problem with the pump? How should a pump bleed go, as I say, I've never had any experience of doing one?
I drained down to replace a couple of radiators. When I refilled, I bled the Grundfoss pump. I have never bled a pump before, and when I loosened and removed the bleed screw, I expected to hear a bit of air escaping like the radiators, followed by a small jet of water.
All I got was a slow drip (with the screw removed), about a small drop of water every 15 seconds or so. Is this normal, or is there a problem with the pump? How should a pump bleed go, as I say, I've never had any experience of doing one?