[pestes]

I got a call back from Randy at HWH, who was very helpful and patient. We went through a few things and eventually the slide started working, although we didn't technically change anything. Thought I'd update this with a few things that I learned, which I'll post over in the appropriate forum as well once I have more time.

The Red and Yellow LEDs on the output board for the slide are (from the top, at least the way mine is mounted, from the edge of the box otherwise):

Unlock
Extend
Retract
Lock

They indicate power being sent to the solenoid. I forgot to ask about red vs yellow. I always see the pair both light up.

There is a red LED in the upper left corner of the slide board (closest LED to the ground bus bar). This LED indicates that the pump pressure sensor is being triggered.

There is a 9 pin molex connector that plugs into the board from the inside slide operation panel. You can remove the control panel from inside and plug it directly into the control board and operate it from there. IE operate the slide and see the LEDs at the same time. Also eliminates the wiring path in between.

I suspect that I actually have a loose pin on the molex for the Retract function. My assumption previously was that because the pump runs when we push the switch towards Retract that the control path was good. However Randy indicated that the switch is actually a DPDT -- it sends 12V on one wire for the pump and it sends 12V on one of two other wires for Retract or Extend. I was assuming (I know, I know) that there was a single signal/wire for Retract and a single signal/wire for Extend and that the controller turned on the pump as a result. But that is not the case.

I suspect that my slide started working as a result of me putting my DMM probe into the Retract pin of the molex to test for voltage from the control panel on that pin. I am guessing that I basically crimped the female pin in the connector around the male pin on the board when doing so.