Whirlpool Cabrio washer making buzzing sound. No error code.

The washer seems to attempt to add water to the tub, and spin, but there is no agitation that we can tell. Just buzzing. My husband took the drain pump and recirculation pump off and there were no foreign objects or debris in them. He thought it sounded like the noise was coming from the recirculation pump, so I ordered one and it came in today. He replaced it and there is no change. Our new addition flooded and I threw the towels in there and hoped for the best, but it spun them out, so we know it's draining. It just won't go through the wash cycle. And not an error code to be found.

Any suggestions on what else to do or try? Don't worry about dumbing it down for me. Husband is a mechanical engineer, he just relies on me to get the answers. :) I have kids, so the laundry is piling up. Your help is appreciated!