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Vaillant Ecotec combi boiler - radiators working but no hot water flow to taps

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  • davidwylie77 Oct 06, 2008

    I have the same problem. Typically, when I turn on the hot water tap, I get hot water for the first 5-10 seconds before it turns as cold as if it was coming from the cold tap.



    My instructions for use booklet offers no solutions. And turning the boiler and/or warmstart function off and on again doesn't work.

  • Alastair Macleod
    Alastair Macleod May 11, 2010

    Do you mean that nothing is coming out of the hot water taps at all, or that the water which comes out of them is cold? If cold water is coming out, is it as cold as the water that comes out the cold tap, or a bit warm?



    A.

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David,

The fact that you're getting a little burst of domestic hot water suggests that the boiler is capable of circulating hot primary loop water through the heat exchanger, but doesn't necessarily do so when it needs to.

What seems to be lacking is a recognition that domestic hot water is now being drawn off, and that the boiler needs to fire up and divert the primary flow through the heat exchanger.

A good place to start might be the flow switch (usually in the bottom of the boiler, where the cold water supply comes in) or the electrical connections to it.

A.

Posted on Oct 07, 2008

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