A disposal that hums without spinning may be jammed. A sink that remains full can also have a blockage in the trap or shared drain. Tell the technician whether the disposal stopped first or whether the sink had already been slow.
Turn it off and observe the other sink bowl
Leave the disposal off and keep hands and tools out of the opening. If the kitchen sink has two bowls, note whether both hold water. Water rising in the other bowl can point toward a restriction beyond the point where the drains join.
Share the history before choosing a repair
Mention anything that fell into the disposal or recent work on the dishwasher or trap. Note whether you have used drain chemicals. The plumber can assess the drain path, and the condition of the disposal may need separate attention.
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