A light hum and water sounds are normal. Repeated knocking, grinding or whining point to something stuck or a struggling pump.
Possible causes
- Spray arm hitting dishes
- Glass or bone in the pump
- Worn circulation pump bearing
- Low water causing a dry pump sound
Safe first checks you can do
Safety: unplug the appliance and close the water tap before any check, and never open the outer casing or electronic boards yourself.
- Rearrange dishes so the arms turn freely
- Clean the filter and look for debris
Related parts
Circulation pumpDrain pumpSpray arms
When do you need a technician?
Continuous grinding from the pump needs checking before the motor is damaged.
Frequently asked questions
Is a loud drain sound normal?
A brief sound while draining is normal; continuous grinding isn't.
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