Once I'm done with this batch of cheese (and washing dishes, dammit) I'll get back to this. From a bunch of reading and youtube videos, I think the circulation pump died. Going to try taking that out once I find hose clamps to replace the ones I'm going to have to destroy to get it out, try cleaning it and putting it back together. If it still doesn't run, I can order a new circulation pump for $90ish and try that in a few days when it arrives.