When a residential dishwasher emits a foul odor resembling rotten eggs during a wash cycle, the smell is typically caused by sulfur-producing bacteria feeding on trapped organic food waste decomposing in the sump filter, or by a plumbing venting issue where sewer gas backs up through the drain hose. You can troubleshoot sulfur odors easily by inspecting the filter. You can verify that your corrective action is successful when removing and scrubbing the cylindrical filter basket, running a hot vinegar cleaning cycle, and ensuring the drain hose has a proper high loop eliminates the rotten egg smell completely.
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