Short answer:
Loud noises usually come from loose items, clogged spray arms, or a failing pump.
Common Dishwasher Noises Explained
- Grinding: Food stuck in pump or chopper
- Rattling: Dishes hitting spray arms
- Humming: Normal—unless it’s very loud
- Banging: Loose drain hose
How to Fix It
- Secure loose dishes
- Clean spray arms
- Check filter and pump area
When It’s a Serious Issue
Persistent grinding or screeching often means motor or pump failure.