I built/rebuilt a 25 HP rotary phase converter that someone had kludged together. I use it to run a 10 HP air compressor. Both were free or I would have done something else because it's really more trouble than its' worth. I wanted to see if I could do it.
I bet the capacitors it takes to...
Looks like there may have been an overflow detection switch that is now no longer wired. Chances are this is due to nuisance trips due to some other underlying issue. Condensate drain plugged, etc.
Plastic pans (the old ones) were bad about cracking over time.
I've also seen units freezing...