Siemens Odor / Bacterial Growth in Sump and Hoses

Dishwasher has a bad odor; it smells musty or like rotten food when opened.

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Possible Causes

Food debris trapped in filters and sump, grease build-up in hoses, infrequent use with the door closed, low-temperature cycles only.

How to Fix / Troubleshooting

Safety first: No electrical work is required; just cleaning.

  • Step 1 – Thorough cleaning:
    • Remove and scrub the filters with hot, soapy water.
    • Clean the sump area, including under the filters, to remove trapped food debris.
  • Step 2 – Door and seals:
    • Wipe the door gasket and inner door edges where residue can accumulate.
  • Step 3 – Hot cleaning cycle:
    • Run an empty hot program with a dishwasher cleaner or a cup of white vinegar placed upright on the top rack (if the manufacturer allows).
  • Step 4 – Usage habits:
    • Leave the door slightly ajar between cycles to allow for proper ventilation.
    • Periodically run a high-temperature program to kill bacteria and dissolve grease.

Regular maintenance cleaning prevents odors and keeps the dishwasher hygienic.

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Video Guide

2 Videos

Repair Difficulty

Very Easy 1/5
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