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    Help with Vaillant ecotec plus 937

    Hi I have a Vaillant ecotec plus 937 its a gen 1 version as far as im aware so doesnt have the menu on the display like the later version. Anyway it was installed in a new build 6 years ago 4 bed detached with 2 adults. last year i installed evohome (with opentherm) using ATP921R3100...