Ran my dishwasher this morning and pulled out plates still covered in grease even though I used the heavy cycle. The spray arms barely moved and I heard this weird humming from the bottom. Sounds like my circulation pump might be shot. Can someone recommend a good guide on bad dishwasher circulation pump signs so I can confirm before calling a tech?

Had almost the same thing last month - dishes came out greasy and the machine just kind of hummed like it was tired of life. Turned out my circulation pump was barely pushing water, so spray arms didn’t spin right. Before I called anyone, I checked a few signs here: signs of a bad dishwasher circulation pump and how to test it  actually matched what I was seeing. In my case, pump swap fixed it, but at least you’ll know for sure before spending money.