Carrier Biological Growth on Coils or in Water Bucket

Dehumidifier emits a musty or moldy odor from the air outlet.

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Possible Causes

Dirty evaporator coil, Standing water residue in bucket, Contaminated air filter, Poor drainage allowing slime buildup

How to Fix / Troubleshooting

Safety first: Unplug the unit. Avoid inhaling dust or mold; consider wearing a mask and gloves.

Steps:

  • 1. Clean bucket: Wash the water bucket with warm water and mild detergent. Disinfect with a diluted bleach solution (1 tablespoon bleach per gallon of water), then rinse thoroughly.
  • 2. Clean filter: Wash or replace the air filter according to Carrier’s instructions.
  • 3. Clean coils: Access the evaporator coil and gently clean with a soft brush and a non-corrosive coil cleaner safe for aluminum. Do not bend fins.
  • 4. Improve ventilation: After cleaning, run the unit in a well-ventilated area to help dry internal surfaces.

Maintenance tip: Empty and dry the bucket if the unit will be unused for extended periods to prevent odors.

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Repair Difficulty

Very Easy 1/5

Required Part

Evaporator Coil
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