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Central Heating Loft Expansion Tank in loft overflowing

Discussion in 'Plumbing and Central Heating' started by Timbercraft, 17 Sep 2012.

  1. Timbercraft

    Timbercraft

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    I have a number of symptoms

    1) When trying to bleed rads, I struggle to get air out, but can hear flowing through the system

    2) But when bleeding them, you would expect the expansion tank to replace the air with water but doesn't, just seems to allow more air in to system.

    3)the water in the expansion tank also get warm/hot whilst overflowing at quite a rate.

    Would I be right in thinking that there is a blockage in the system and what is the best solution (apart from a full system flush)? would part draining system and refilling with cleaner/sludge remover, running system, draining, refilling possibly repeating and then refilling with inhibitor work?

    Any advice would be appreciated, Thanks Tim
     
  2. Armo74

    Armo74

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    Check where your cold feed from the F/E tank tee's into the flow pipe with a magnet to try and locate the blockage. If you have one which it sounds likely the magnet will stick to the pipe and the system will be drawing air in through the ventpipe. You may have to cut the pipework and re-pipe to get rid of the blockage.
     
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  3. Timbercraft

    Timbercraft

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    Will have a look in the morning and let you know I get on, thanks Tim
     
  4. gaspro1981

    gaspro1981

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    Are you tring to vent/bleed the system with the circulating pump running ??
     
  5. Timbercraft

    Timbercraft

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    I have tried bleeding system, with heating off and on
     
  6. gaspro1981

    gaspro1981

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    Always best to fill and vent systems with the boiler and pumps being turned off
    As stated check for blockages in the cold feed into the system
     
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