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  1. J

    New Vaillant timeSWITCH 150 not working as expected

    The timeswitch on my Vaillant boiler packed up recently so this afternoon I bought and installed a new one. Followed the instructions, and although I can turn the heating on manually (when the dial is set to on) the timer itself isn't ticking, which is exactly why I carried out a replacement. I...
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