Check the model's operating sequence and establish its required water flow before grinding. This gives you a chance to notice a blocked sink or interrupted supply before adding more material.
What the observation tells you
A tap running somewhere in the bowl does not automatically mean water reaches the disposer opening. Plates, a washing-up bowl or an incorrectly positioned stopper can divert or retain it. Arrange the sink so the approved flow reaches the opening without handling anything inside.
A useful next step
Only then use the normal control and feed suitable scraps at the recommended rate. Stop if water starts accumulating rather than draining away.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.