@tyler_hallberg omg…
It was behind a false wall, had no clue there was a water flow sensor on this thing. I was following wires to see if anything may have fried, removed a panel and bam right there. As far as I can see online no many had a sensor from the factory? Odd to me that the test button still worked even without a water flow being sensed. Very odd.
The test button on the supply doesn’t care about interlocks.
Well hey, at lease I know this machine inside and out now, including the whole PSU, and it had some bad solder joints so those got taken care of as well. Hah. Now back to my shifting in the pictures.