E4
Ikea
Defrost System Error (Sensor/Heater Feedback)
Freezer shows E4 and may have irregular defrosting or ice build-up.
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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
Defective defrost sensor, Open defrost heater, Faulty defrost thermostat, Control board timing error
How to Fix / Troubleshooting
Safety: Unplug the freezer before working near the evaporator or heater.
Steps:
- 1. Inspect evaporator: Remove the inner rear panel and check for heavy ice build-up, which indicates poor defrosting.
- 2. Test defrost sensor: Measure resistance of the evaporator NTC and compare to expected values.
- 3. Test heater and thermostat: Check continuity of the defrost heater and any thermal fuse/thermostat in series.
- 4. Replace faulty components: Replace any open heater, blown fuse, or defective sensor.
- 5. Control board: If all components test good, the control board may not be initiating or terminating defrost correctly and may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater Assembly
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