Schulthess Biofilm and mold buildup

Washer has a persistent musty or moldy odor inside the drum.

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Possible Causes

Frequent low-temperature washes, Residual detergent and softener in tub, Door kept closed between cycles, Blocked drain causing standing water

How to Fix / Troubleshooting

Safety first: Use appropriate cleaning agents and avoid mixing chemicals (e.g., bleach and acids).

  • Step 1 – Drum clean cycle: Run a maintenance or drum-clean program at 90–95°C with a washing machine cleaner or a small amount of bleach (if compatible with your model).
  • Step 2 – Clean gasket: Wipe the door gasket folds with a cloth and mild detergent, removing black mold and residue.
  • Step 3 – Clean dispenser: Remove and scrub the detergent drawer and housing to remove slime and mold.
  • Step 4 – Ventilation: Leave the door and dispenser drawer slightly open between washes to allow drying.
  • Step 5 – Drain check: Ensure the pump filter is clean so water fully drains after cycles.
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Repair Difficulty

Very Easy 1/5
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