F4
Ariston
Defrost System Failure
Freezer displays error code F4 and may show signs of excessive frost or ice on 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
Defective defrost heater, Failed defrost thermostat, Faulty defrost timer or electronic control, Wiring fault in defrost circuit
How to Fix / Troubleshooting
Safety first: Unplug the freezer before working near the evaporator or heater.
- Manual defrost: Open the door, remove food, and allow all ice to melt naturally. Use towels to absorb water. Do not use sharp tools.
- Test heater and thermostat: With panels removed, use a multimeter to check continuity of the heater and defrost thermostat. Replace any open components with Ariston-approved parts.
- Reassemble and monitor: After replacing parts and reassembling, monitor for several days to ensure frost does not rapidly return.
When to call a technician: If F4 persists despite new heater/thermostat, the electronic defrost control on the PCB likely needs professional replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Defrost Heater
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