A weird noise in a Bosch dishwasher turned out to be a simple fix I almost missed
I was on a call last week for a Bosch 800 series with a loud grinding sound during the wash cycle. The owner was sure the circulation pump was shot, and I was leaning that way too after hearing it. Before ordering the part, I decided to pull the filter assembly and spray arm one more time. Stuck in the very bottom of the sump, under the filter, was a single piece of broken glass from a cup. It was just big enough to get caught in the impeller area when the pump kicked on, making that awful noise. I fished it out with a magnet tool, put everything back, and the unit ran quiet as new. I almost cost the customer a $200 pump and an hour of labor over a tiny shard. It made me slow down and check the simple stuff first, even when the symptom points right at a big part. What's the smallest thing you've found that was causing a major noise or fault?