Sub-Zero
Interior Contamination / Drain Biofilm
Refrigerator emits a strong musty or moldy odor inside.
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Possible Causes
Spilled food or liquids in hidden areas, Mold growth in drain trough, Stagnant water in drain pan, Dirty door gaskets and shelves
How to Fix / Troubleshooting
Safety first: Unplug the unit before using water near electrical components. Use non‑abrasive, food‑safe cleaners.
Step 1 – Remove all food
- Empty the refrigerator and discard spoiled items.
Step 2 – Deep clean interior
- Wash all shelves, bins, and walls with a solution of warm water and baking soda or mild detergent.
- Pay special attention to crevices, under shelves, and around gaskets.
Step 3 – Clean drain trough and pan
- Access the evaporator drain trough and flush with warm water and a small amount of vinegar to remove biofilm.
- Clean the external drain pan under the unit with hot soapy water.
Step 4 – Deodorize
- Place an open box of baking soda or a refrigerator deodorizer inside to absorb residual odors.
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Repair Difficulty
Very Easy
1/5
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