OK, so we wired up the plug, swapped the quick connect for a male connector so we could connect into an air line and hooked up the sump pump to just recirculate water.
Water flow: Looks like it's restricted internally to 20GPH or clogged. Water flow looked like about 20 GPH to me so I think the former is most likely, definitely getting flow though.
Power: We have lights but no joy on heat or rotation.
Pneumatic: I think this drives the coil up/down mechanism and that is working
We cracked the back thinking we'd see something about as complex as a washing machine and instead found this. I recommend obtaining a manual for the machine and verifying we're operating it correctly and, if so, maybe it has some basic troubleshooting steps to take.