Sub-Zero Defrost Drain or Drain Pan Leak

Water leaking from the front or bottom of the Sub‑Zero refrigerator onto the floor.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Clogged defrost drain tube, Frozen drain trough under evaporator, Cracked drain pan, Misaligned or overflowing condensate pan due to high humidity

How to Fix / Troubleshooting

Safety first: Unplug the refrigerator before removing panels. Use towels to prevent slipping on water.

Step 1 – Identify leak source

Remove the toe‑kick grille and inspect the drain pan for cracks or overflow.
Check inside the freezer or refrigerator for ice buildup under drawers or at the back wall.

Step 2 – Clear defrost drain

Access the evaporator area and locate the drain hole or trough beneath it.
Use warm water in a turkey baster or squeeze bottle to flush the drain until water flows freely into the pan.
If the drain is frozen, gently thaw with warm water; avoid sharp tools.

Step 3 – Inspect drain pan

Examine the drain pan for cracks or warping; replace if damaged.
Ensure the pan is properly seated and level.

Step 4 – Reassemble and monitor

Reinstall panels and monitor for leaks over several days.

Repair Difficulty

Medium 3/5

Required Part

Defrost Drain Tube

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