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Vaillant combi boiler problem

I have a Vaillant combi boiler - don't know which one - The hot water light has stopped coming on and the light that looks like two pyramids one upside down on top of the other one keeps flashing. Oh and the hot water is not getting hot. Any ideas?

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  • Boston A Jan 13, 2009

    my boiler has a similar problem when i switch to hot water only the indecator light is not lighting up and we have no hot water

  • bordakar Jan 23, 2009

    I have a combi valliant boiler I do not know which one. The heating is all right
    but we do not get hot water (only tepid) This was fixed about two years ago
    I think the engineer fitted a new valve. The problem re-occurred again.
    Any solutions?


  • nikkib45 May 12, 2009

    problem same as toddfellows's boiler also makes a terrible noise once hot water is turned on.

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When the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
the egg timer symbol (or two pyramids together) is an ignition indicator turn off and on again to see if it will fire with the tap running. reset the boiler with the lower right hand control knob.

Posted on Mar 26, 2009

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Posted on Jan 02, 2017

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