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    New PCB in older Vaillant ecoTEC plus 618 R1 not responding to request for heat

    Firstly, I'm not going to attempt to do any rewiring my self - but I do have a Gas Safe plumber on the job currently (waiting for an internal pipe that is leaking a bit), and I want to get informed on our situation so when he comes back we can get it sorted asap. I have a Y plan heating setup...
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