F4
Amica
Defrost Circuit Failure
Display shows F4; heavy frost or ice buildup on evaporator; poor cooling
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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 defrost heater, Failed defrost thermostat/sensor, Faulty defrost relay on PCB, Wiring break in defrost circuit
How to Fix / Troubleshooting
Safety: Unplug the refrigerator before working near the evaporator and heater.
Steps:
- 1. Manually defrost: Fully defrost the unit to restore temporary operation and allow inspection.
- 2. Test heater and thermostat: Use a multimeter to check heater resistance and thermostat continuity as described in other defrost-related entries.
- 3. Inspect wiring: Look for burnt connectors or broken wires around the heater and thermostat.
- 4. Replace faulty parts: Install a new heater or thermostat as needed, ensuring correct routing of wires away from hot surfaces.
- 5. Control board: If all components test good, the defrost relay or logic on the board may be defective; replace the board via a professional.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater
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