Proline
Defrost System Failure
Heavy frost and ice buildup on the evaporator behind the rear panel; airflow is restricted and cooling performance drops.
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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, Faulty defrost sensor, Defective main control PCB not initiating defrost
How to Fix / Troubleshooting
Safety first: Unplug the freezer and protect the floor with towels. Do not use sharp tools to remove ice.
Steps to address heavy frost:
- 1. Manual defrost: Remove food to a cool location, open the door, and allow all ice to melt completely. This may take several hours.
- 2. Access defrost components: Remove the inner rear panel to expose the evaporator, heater, and defrost thermostat/sensor.
- 3. Test heater and thermostat: Use a multimeter to check continuity of the defrost heater and thermostat (see defrost-related error entries). Replace any open components.
- 4. Check defrost sensor: Measure resistance of the defrost NTC sensor and compare to expected values. Replace if out of range.
- 5. Control board: If all defrost components test good, the main control PCB may not be initiating defrost and may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater Assembly
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