Hi Jon, Would you mind sending me the rewiring options you considered - I also have the ZP5A breakout board and I'm finding the same problem (I think) after wiring all my limit switches up as NC and then wiring them directly into the breakout board. I've also been wondering if the user guide is wrong since I've managed to set up my homing by wiring the metal plates into the terminals marked GND rather than the one marked with the pin number e.g. (for instance) P14. It could be my misunderstanding but the Chinglish instructions are a right royal pain for helping me to understand!