@Phaedrux @fcwilt Thank you both. This has been resolved. It was the "deploy" wire. Surprisingly it wasn't actually my wiring, although it may have been my abuse that caused it. The orange deploy wire somehow had a broken connection. Visually it looked fine but the multi-meter said otherwise. Cut soldered etc and it works.
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RE: BLTouch Works on power on but not with any commandsposted in Duet Hardware and wiring