Wiring issue still relevant today. Plugged in using instructions, didn't work. I thought I fried my main board by reversing the wiring and seeing a puff of smoke and a flash. Turns out it was a fuse that strangely, was still good? Set up back the way they had wired it originally then moved blue pin to z-stop and it worked fine. Thank you for pointing out that the blue wire, and not the white wire is the sensor. Guess I got lucky, printer still heats up the bed, nozzle and all axis function properly...