F3
Haier
Defrost Sensor / Evaporator Sensor Error
Freezer shows F3 and may not defrost correctly.
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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
Open or shorted defrost NTC sensor, Sensor dislodged from evaporator, Harness damage from ice, Faulty main PCB
How to Fix / Troubleshooting
Safety first: Unplug the freezer and wear gloves when working around sharp evaporator fins.
- Access evaporator: Remove inner rear panel to expose the evaporator coil.
- Locate defrost sensor: Typically clipped to the evaporator tubing or in a small plastic housing.
- Test sensor: Disconnect and measure resistance at room temperature and again after cooling with ice. Resistance should change smoothly. Replace if readings are erratic or out of spec.
- Secure sensor: Ensure the sensor is firmly attached to the coil in the correct position.
- Check wiring and board: Repair any damaged wires and reseat connectors. Replace main PCB if F3 persists with a known-good sensor.
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Repair Difficulty
Medium
3/5
Required Part
Defrost / Evaporator NTC Sensor
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