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    VAILLANT 831 not reaching temp

    Hi all First post, please help Moved into a house in the summer Has a 2011 Vaillant eco tec plus 831 Had heating on for a week or two and can’t get the boiler to go above 50 ish degrees on heating Flow temp on the dial is set to 70 But when it gets to 50 it knocks off Checked the d.0 etc and...
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