Gree Odor / Biological Growth in Drain System

Musty or moldy odor coming from the dehumidifier during operation.

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Possible Causes

Mold or mildew in water tank, Slime buildup in drain pan and channels, Dirty air filter and coils, Standing water in hose or tank

How to Fix / Troubleshooting

Safety: Unplug the unit. Wear gloves and, if sensitive, a mask when cleaning mold.

Steps:

  • Tank cleaning: Remove the water tank and wash with warm water and mild detergent. Disinfect with a diluted bleach solution (follow manufacturer guidance) and rinse thoroughly.
  • Drain pan: Access the internal drain pan under the evaporator. Wipe away slime and mold with a cloth and disinfectant.
  • Filter and coils: Clean the air filter and gently vacuum dust from coils.
  • Hose: If using a drain hose, flush it with a disinfectant solution and allow to dry.
  • Regular maintenance: Empty the tank daily in humid seasons and clean monthly to prevent recurrence.
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Repair Difficulty

Very Easy 1/5

Required Part

Water Tank
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