Sub-Zero Frost Buildup – Defrost or Door Seal Problem

Frost or ice buildup on the back wall or around the evaporator area inside the wine cooler.

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

Defective defrost heater or thermostat, Clogged defrost drain causing ice accumulation, Door gasket leak allowing moist air in, Door frequently left open

How to Fix / Troubleshooting

Safety first: Disconnect power before defrosting or removing panels. Do not use sharp tools to remove ice.

Step 1 – Manual defrost

Remove all product and shelves.
Leave the door open and power off for 24 hours to fully melt ice; use towels to absorb water.

Step 2 – Check door gasket

Inspect for tears or gaps; replace if damaged.
Ensure the door closes fully and is not obstructed.

Step 3 – Clear drain

Clear the defrost drain as described in the internal leak procedure.

Step 4 – Defrost system diagnosis

If frost returns quickly, the defrost heater or thermostat may be faulty and should be tested and replaced as needed (see EC50).

Repair Difficulty

Medium 3/5

Required Part

Defrost Thermostat

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