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    Vaillant Turbomax strange pressure loss pattern, HELP!

    Hi all Any advice welcomed I have a Turbomax VUW282 that is loosing pressure fast when my ground floor loop is on but only very slowly when just my 1st floor loop is on (boiler on 1st floor), I set pressure to 1bar cold and it can drop to 0 cold in less than a day. Pressure when in use is...
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