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Air lock in central heating pipes re-routed up and down through the loft

Discussion in 'Plumbing and Central Heating' started by Novice111, 1 Oct 2015.

  1. Novice111

    Novice111

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    Today I had the flow and return pipes for my extension (on a separate zone) rerouted through my loft. It seems that I have an air lock in the return pipe as it isn't getting warm, even though the flow pipe is. My plumber had advised me that this shouldn't be a problem as I have a system boiler (and hence is pressurised). However, it now appears that there is an air lock and he is now considering whether air vents in the pipes are the answer. Do you think this is the case and should this have been done in the first place?
     
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  3. Boilerman2

    Boilerman2

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    Auto air vents should always be fitted at any high point air locks will occur on sealed systems too!
     
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  4. Novice111

    Novice111

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    Oh, I see, thanks.
     
    Last edited: 2 Oct 2015
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