I sent him this print over the weekend. Still waiting for an answer to my question because the only single failure I see that would cause that in both directions is if you had no voltage to 45B. The direction relays wouldn’t be able to self hold so you’d loose direction and stop as soon as you step to your floor. Side affect of that though is you couldn’t pick SHA until you picked a direction. Could be the diode or connections on the Hydro 1 board.