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    Why is this Vailliant ecoTEC boiler immediately shutting itself down?

    UPDATE: Solution was to replace the PCB.
  2. L

    Why is this Vailliant ecoTEC boiler immediately shutting itself down?

    Thanks for the reply. I will have a look at the wiring and see if anything stands out.
  3. L

    Why is this Vailliant ecoTEC boiler immediately shutting itself down?

    This is a Vaillant ecoTEC plus 831. It completely shuts down (screens off etc) at instant of heat demand. Never ignites. After turning it back on, even if no heat demand is made it will still shut itself down in a minute or so. Also any time it shuts down you will not be able to turn it on again...
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