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Does this mean running a new wire from hive receiver “HW off” up to the new trunk box and hook up to orange wire will fix it? Or which wire

I have a Potterton Sumprima 30 with the PTT2 tank stat unit which crumbled over time leaving live wiring - so replaced as per above. I also have Hive Heating which has been working fine. I have replaced the PTT2 with Standard Honeywell L614a tank stat and wired up as per instructions and...