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Thread: Boiler control failure

  1. #1
    Automated Home Lurker
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    Sep 2007
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    Default Boiler control failure

    Hi.

    I have a modern Halstean Eden VBX18 boiler (open vent system) which has worked fine thoughout the summer heating the the hot water for washing but when I started the central heating system for this recent cold snap the boiler would start up and run for a few minutes and then shutdown and remain off.
    Restarting the heating system would result in the same problem.

    I have checked for air locks and the pump keeps running even when the boiler stops.
    Some of the upstairs radiators gets warm during the short burst of operation indicating the contol valve is operating and since the sytem does start up, if only for a short time, I guess the room themostat is ok.

    Can I assume that the control failure is with the boiler despite it working fine for hot water?

  2. #2
    Moderator sunbeam's Avatar
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    Feb 2006
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    Default

    I would almost certainly say it was the diverter valve stuck in the hot water position,
    or the zone valve if you don't have a diverter.

    although the valve seems to be motoring, the ball inside the valve could be stuck.

  3. #3
    Automated Home Lurker
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    Sep 2007
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    Default boiler control

    thanks Sunbeam, will check it out.

    Chris

  4. #4
    Automated Home Lurker
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    Default boiler fixed

    There was nothing wrong with any of the equipment, it was all my own silly fault.
    In order to change the bath tap washers without draining the tank I turned off all the valves I could find serving the hot water system including a bypass valve that should have not been toiuched, when I was finished I opened all the valves again including the bypass valve which was now fully open and resulted in the central heating not working.

  5. #5
    Moderator sunbeam's Avatar
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    All's well that ends well.

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