What the symptom may mean
The unit hums without turning normally may involve an obstruction, overload or motor condition. An engineer assesses the actual appliance; a symptom alone does not identify a component.
Useful details from ordinary use
Record whether water backs up; stop activating it. Separate the selected programme or control setting from the result you saw or heard. Keep the exact display message if one appeared.
Find the product, safely
Use the accessible underside label only if safe. Photograph the model without reaching into the grinding chamber.
Tell us whether it has a continuous-feed switch or batch-feed stopper and whether there is safe under-sink access.
Stop if it becomes unsafe
Do not remove covers, reach into moving parts or continue using an appliance with smoke, sparking, a burning smell, water near electrical parts or repeated tripping. Do not restart it to reproduce the problem.
Choose the actual brand
Your repair notes
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