dF

AEG Defrost System Error / Defrost Timeout

Display shows dF and the refrigerator may be stuck in or unable to complete defrost.

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.

Possible Causes

Defective defrost heater, Failed defrost thermostat, Faulty defrost sensor, Control board defrost timing fault

How to Fix / Troubleshooting

Safety first: Unplug the appliance before accessing the evaporator or electrical components.

Manual defrost:

Open doors and allow all ice to melt from the evaporator area. This can temporarily restore cooling and help confirm a defrost issue.

Component testing (for experienced DIYers):

Access the evaporator by removing the rear inner panel in the freezer.
Test the defrost heater and thermostat with a multimeter as described for defrost faults (continuity and resistance checks).
Inspect the defrost sensor (NTC) and wiring for damage.

Repair:

Replace any failed heater, thermostat, or sensor components.
If all components test good, the main control board may not be initiating or terminating defrost correctly and may need replacement.

Repair Difficulty

Hard 4/5

Required Part

Defrost Thermostat

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