Sub-Zero Internal Leak – Clogged Defrost Drain

Water leaking inside the wine cooler; puddles form on the bottom of the compartment.

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Possible Causes

Blocked defrost drain tube, Ice buildup over drain trough, Debris or mold in drain grommet, Improper unit leveling causing water to miss drain

How to Fix / Troubleshooting

Safety first: Disconnect power before removing interior panels. Use towels to catch water and melted ice.

Step 1 – Access drain area

  • Remove shelves and the rear interior panel to expose the evaporator and drain trough.
  • Look for standing water or ice in the trough.

Step 2 – Clear ice and debris

  • Use warm (not boiling) water to melt ice in the trough and drain opening.
  • Use a small flexible brush or pipe cleaner to clear the drain hole.

Step 3 – Flush drain tube

  • Using a turkey baster or squeeze bottle, flush warm water down the drain until it flows freely into the drain pan near the compressor.

Step 4 – Check leveling

  • Ensure the unit is slightly tilted back so water flows toward the drain.
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Repair Difficulty

Easy 2/5

Required Part

Defrost Drain Tube
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