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How do I clear an airlock in the central heating system after refilling?

Discuss How do I clear an airlock in the central heating system after refilling? at UK Plumbers Forums; Hi all What is the best way to get rid of an airlock on a F&E system as I have drained down the system and then refilled after changing a ...
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    Default How do I clear an airlock in the central heating system after refilling?

    Hi all

    What is the best way to get rid of an airlock on a F&E system as I have drained down the system and then refilled after changing a few rads to new ones?

    I've bled all the rads i.e starting with the ground floor ones and then making my round to all the other rads on the bedroom and landing level?

    Do I have to drain down again?? Any ideas and how to do it are much appreciated!

    Many thanks

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    Default Re: How do I clear an airlock in the central heating system after refilling?

    did you lock open the three/two port when refilling?
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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Have you opened all radiator valves,are all radiators affected
    Last edited by glenno1; 18-05-2012 at 01:11 PM.

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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Last time this happened to me I put a garden hose on the drain point and blasted mains water in the the pipework this cleared it. Open vented always a pain for air locks!

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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Is there an air bleed valve on a standpipe next to the motorised valve(s) that you have forgotten to bleed?

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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Fill slowly helps. Turn on pump but not boiler and close rad's all rads except furthest away. Do not let pump run dry. The idea is that the pump will push the water around the furthers part of the system then work back turning on and bleeding rads as you do. Can do it the other way as well. If the airlock is down the cold feed try blowing down the vent. You can sometimes crack the cold feed pipe union at the boiler and let air out. It all depends on where it is.

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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Hi all

    I think its a combination of the lot to be fair!

    1. The bathroom rad isn't getting hot and have bled every single radiator including that one!

    2. I believe this system has a two 2x2 port valves so is it ok to move switch across without doing damage? So no I haven't open them in this case or closed them.

    3. I think there is a bleed valve on the vertical standpipe by the HWC but it looks lime scaled up and with a green tinge which I didn't want to open in case I caused a mini flood and couldn't close it again! - Am I ok to open this?

    Is it ok to use the hose pipe main like Duncan said above as I would wanna damage any components in the system especially if 2 port vales were closed etc?

    Many thanks to all for your time

    Martyn

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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Manually open both 2 ports, the lever is normally in the auto position but can be moved to the manual open position. vent from air vent, and the bleed screw on front of pump. job done
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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Again - thanks to all for being very informative!

    This forum can be invaluable

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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Is it ok to use the hose pipe main like Duncan said above as I would wanna damage any components in the system especially if 2 port vales were closed etc?
    Yes I've done it many times and it usually clears the airlock.
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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Slowly slowly catchy money and as eco suggested both valves manual. It can take a while

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    Default Re: How do I clear an airlock in the central heating system after refilling?

    Use your wet vac on the vent pipe! Suck out the blockage.
    tommy1712 likes this.

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