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    Vaillant Turbomax plus - F24 lockout

    Hi all, I have a Turbomax plus 824E (or 242/2). Been having a problem the last couple of days with it locking out with code F24. Reset and all is fine, for a while, but it's doing it a couple of times a day. Servicing manual suggests this code is due to pump failure, low flow, air lock...
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