Neff
Defrost System Failure
Heavy frost or ice buildup on the rear wall and around the evaporator.
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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, Open defrost thermostat or thermal fuse, Faulty defrost sensor, Main control module not initiating defrost
How to Fix / Troubleshooting
Safety: Unplug the freezer before accessing the evaporator and heater. Risk of electric shock and sharp edges.
Steps:
- 1. Manual defrost: Empty the freezer and leave the door open for 24 hours to melt all ice. Use towels to absorb water.
- 2. Access components: Remove the rear inner panel to expose the evaporator, defrost heater, and thermostat/sensor.
- 3. Test heater: Disconnect the heater and measure resistance. Replace if open.
- 4. Test thermostat/fuse: Check continuity across the defrost thermostat or thermal fuse when cold. Replace if open.
- 5. Sensor and control: If heater and thermostat are good, test the defrost sensor and consider replacing the main control module if it does not initiate defrost cycles.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater Assembly
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