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    Vaillant 415 ecoTEC plus

    I have this new boiler installed few months ago. now I have something strange the boiler has to two temperature controls one for CH ( 30 °C - 75 °C ) and one for HW ( 35 °C- 65 °C ) when i set the controls at two different temperatures the boiler will go for the lower one to be more precise I...
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