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    Vaillant ecoTEC plus will not switch off the heating

    I've got the 3-way valve (about 2 years old) and looks identical to your picture. I'm not upto messing with wires (I'll have to call an engineer for that) but ChrisR mentions above about checking if the orange wire is live or not when the boiler is supposed to be on or off. Does this ring true...
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    Vaillant ecoTEC plus will not switch off the heating

    It's a 418, cheers.
  3. T

    Vaillant ecoTEC plus will not switch off the heating

    Hi, I have a Vaillant ecoTEC plus boiler (in garage), Honeywell ST9400C controller and a bog standard Honeywell "dial" thermostat (in hall). The problem is that this boiler has a mind of its own and will switch the heating off and on when it likes and will not do what the controller and...
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