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    Boiler shutting down when energising S/L?

    Hi - I’ve upgraded old stat for new Nest stat and heat link - all working as it should, except that when switched live is energised via 3-port valve (orange) or cylinder stat, it seems to switch the boiler off? Boiler is Ideal Icos HE15 3-port Danfoss HSA3 Cylinder stat Drayton HTS3 All wired...
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