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Possible airlock after refilling central heating system

Discussion in 'Plumbing and Central Heating' started by Gossamer, 16 Feb 2016.

  1. Gossamer


    2 Dec 2015
    Thanks Received:
    United Kingdom
    I’ve installed new radiators in my house (7) and new piping throughout. I refilled the system and now the pump makes a whirring sound and the boiler cuts out after a few minutes of providing hot water. It’s an open vented system and a Worcester 14/19cbi boiler. I’ve identified a few possible causes / tried a few things, just wondered what the great and good here thought.
    1. I didn’t open the three way valve before draining / refilling. Could this cause an airlock?
    2. All the rads are full and no air comes out if I bleed them but even when hot water is supplied they don’t get any heat at all.
    3. I don’t see any water leaks.
    4. The pump is noisy and gargles but if I bleed it no air and little water comes out.
    5. I’ve opened the valve above the boiler and water squirted out so that appears full.
    6. The f/e tank has water in and works ok.
    7. I’ve tried ‘rocking’ the pump but it didn’t do much.

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