Bosch Biofilm and Mold Build-Up

Washer-dryer emits a musty or moldy odor from the drum

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Possible Causes

Frequent low-temperature washes, Residual detergent and fabric softener, Door kept closed between cycles, Blocked drain and sump area

How to Fix / Troubleshooting

Safety first: Unplug the appliance before cleaning internal parts.

  • 1. Run cleaning cycle: Use a Bosch-approved washing machine cleaner or a hot 90°C cycle with no laundry to kill bacteria and remove residue.
  • 2. Clean door seal: Wipe the gasket folds with a cloth and mild bleach solution to remove mold.
  • 3. Clean detergent drawer: Remove and scrub the drawer and housing to eliminate slime and mold.
  • 4. Leave door open: After use, leave the door and detergent drawer slightly open to allow drying and prevent odors.
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Repair Difficulty

Very Easy 1/5
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