dF
Liebherr
Defrost System Failure (General)
Display shows dF or a defrost-related alarm; heavy frost forms on the back wall or in the freezer despite NoFrost design.
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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 sensor, Faulty defrost timer logic on PCB, Wiring fault in defrost circuit
How to Fix / Troubleshooting
Safety first: Unplug the refrigerator. Water from melting ice can create slip hazards; place towels around the unit.
Step-by-step:
- Manual defrost: Open doors and allow the unit to defrost fully for 24 hours with towels to catch water. This can temporarily restore cooling if the issue is ice blockage.
- Check airflow: After defrosting, verify that fans run and air outlets are not blocked by food.
- Inspect defrost components: If the problem recurs quickly, access the evaporator and test the defrost heater and sensor as described in other defrost-related entries.
- Control check: If heater and sensor test good, the main control board may not be initiating defrost cycles correctly and may require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater or Defrost Control Circuit
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