F5
Liebherr Defrost Heater Circuit Fault

Freezer shows F5; may not defrost; fan noise may change; ice accumulation on 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

Open-circuit defrost heater element, Burnt connector at heater terminals, Faulty defrost relay on main control board

How to Fix / Troubleshooting

Safety first: Unplug the freezer. The defrost heater operates at mains voltage.

Steps:

  • Access evaporator and heater: Remove drawers and rear interior panel. The defrost heater is typically a metal or glass-encased element attached to the bottom or around the perimeter of the evaporator.
  • Visual inspection: Look for burnt spots, broken heater tubes, or melted connectors.
  • Continuity test: Disconnect heater leads and measure resistance. An infinite reading indicates a failed heater.
  • Check wiring: Inspect the harness from the heater to the control board for signs of overheating or breaks.

Remedy: Replace the defrost heater with a Liebherr-specified replacement. Ensure all terminals are tight and insulated. If the heater tests good but F5 persists, the defrost relay or main control board may be defective and should be evaluated by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Defrost Heater Element
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