No heating but hot water

Discussion in 'Plumbing and Central Heating' started by emphasis303, 4 Apr 2015.

  1. emphasis303


    31 May 2007
    Thanks Received:
    United Kingdom
    Good afternoon all,

    Following on from a post I made roughly a month ago, which can be found where I wrote about not having heating downstairs but upstairs was fine. The system is one pipe with 19 rads up and down and an Ecomax 635 system boiler.

    I have since discovered a method of making the heating work downstairs to 60percent satisfaction.

    1. Drain the system completely.
    2. Refill the system.
    3. Set the programmer to Hot water only.
    4.Allow the hot water cylinder to fill.
    5. Close all upstairs rads and leave only 2 of the 8 downstairs on.
    6.Turn the hot water off and then set the programmer to heating.
    7. The 2 rads that are on will heat up wonderfully.
    8. Turn on the remainder of downstairs and they will all then be 60%warm rather than stone cold.

    That is the best I have been able to do, the main point of interest that may signify the cause is the fact that the heating will only work downstairs after the hot water has been running.

    I want to be able to identify the issue 100% so I can go ahead with a fix. I know the first thing I should be doing is a replumb in 22mm with a 2 pipe system however I can't do that for at least 6 - 12months.

    So any ideas if we are talking about a definite blockage? I have power flushed, mains flushed the pipework, fitted a magna clean on 28mm pipework! Still the same issue, with the only way to get heating downstairs by letting the boiler fill the hot water cylinder then turn on the heating.

    Thank you[/url]
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  3. Agile


    26 Jun 2004
    Thanks Received:
    United Kingdom
    I think that you need a heating engineer who understands your system who can tell you what you need to do!

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