AEG Defrost System Failure

Excessive frost or ice buildup on the back wall of the freezer.

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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.

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Possible Causes

Failed defrost heater, Faulty defrost thermostat, Defective defrost sensor, Control board not initiating defrost

How to Fix / Troubleshooting

Immediate action: Unplug the refrigerator and perform a full manual defrost by leaving doors open until all ice has melted. Place towels to absorb water.

After defrost:

  • Restore power and monitor. If heavy frost returns within a few days, the automatic defrost system is likely faulty.

Component checks (for experienced DIYers):

  • Access the evaporator by removing the rear inner panel in the freezer.
  • Test the defrost heater and thermostat for continuity with a multimeter; replace any open components.
  • Inspect the defrost sensor and wiring for damage.
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Repair Difficulty

Hard 4/5

Required Part

Defrost Heater
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