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Ianmcd, many thanks for your prompt reply. understood, so an additional relay to pull in the HW when the CH starts makes sense now, shame they haven't built it in to the controller, but hey ho, I'll do some research today and see if it's better to look for an alternative kit or source and wire...

Hi, my first post here as a newbie so hopefully I've got this right. I'm a qualified spark so no issues regarding regs etc. I've today changed a Drayton Tempus Three to a Drayton wiser kit two. Wiring at the programmer/time clock exactly the same as the wiser two a simple swap over. All...