Miele Microbial Growth / Contaminated Tanks and Filters

Strong musty or foul odor from exhaust air during use

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Possible Causes

Dirty water left in tank for long periods, Damp filters not dried, Bacteria growth in hoses and tanks, Use of non-sanitizing detergents

How to Fix / Troubleshooting

Safety: Unplug before cleaning. Wear gloves if mold is present.

  • Deep clean tanks: Empty and scrub both clean and dirty water tanks with warm water and mild disinfectant. Rinse thoroughly.
  • Clean hoses and tools: Flush hoses and tools with a mild disinfectant solution, then rinse and allow to dry completely.
  • Replace filters: Replace any filters that smell musty or show mold growth.
  • Dry after use: After each use, empty tanks, run the unit briefly with clean water only, then leave tanks and lids open to air dry.
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Repair Difficulty

Very Easy 1/5

Required Part

Filter Set and Tanks
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