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    Vaillant VCW GB 221H Won't fire up

    Hi I have a Vaillant vcw gb 221h combi boiler. After flushing out and refilling, the system worked fine for about 2 hrs firing up giving hot water and central heating. then it stopped firing up. Seems to make all the right noises prior to it firing up just doesn't. Currently have no HW or CH...
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