Zanussi Defrost system failure

Excessive frost or ice build-up 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 or sensor, Defective defrost control on PCB, Door not sealing causing excess moisture

How to Fix / Troubleshooting

Safety: Unplug the refrigerator before removing freezer panels.

Immediate action:

  • Manual defrost: Switch off the appliance and leave doors open for 24 hours to melt ice. Place towels to absorb water.
  • Check door seals: Inspect freezer gasket for gaps or damage. Replace if not sealing properly.
  • Inspect defrost components: After defrosting, remove the rear freezer panel and visually inspect the heater and thermostat. Burn marks or broken wires indicate failure.
  • Test components: If you have a multimeter, test heater and thermostat continuity. Replace faulty parts.

Note: If ice build-up returns quickly, the defrost control on the PCB may be faulty and should be checked by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Defrost Heater Assembly
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