Display shows dF; refrigerator may run defrost too often or not cool properly

Safety: Unplug the appliance before accessing the evaporator or heater. The heater operates at mains voltage and can be hot.

Procedure:

• 1. Visual inspection: Remove freezer drawers and inner rear panel to expose the evaporator and heater. Look for burnt or broken heater elements and melted wiring insulation.
• 2. Test the heater: With the unit unplugged, disconnect the heater terminals and measure resistance. A typical heater will show a finite resistance (often 50–300 Ω). Infinite resistance indicates an open heater that must be replaced.
• 3. Check the defrost sensor/thermostat: Verify continuity or NTC resistance as appropriate. Replace if out of specification.
• 4. Wiring and connectors: Inspect all connectors in the defrost circuit for corrosion or looseness. Repair any damaged wires.
• 5. Control board: If heater and sensor are good but dF persists and the evaporator ices up, the defrost relay or control logic on the main board may be faulty. Replace the board via a professional.

Important: After replacing components, fully defrost the evaporator before returning the unit to service to avoid immediate re-icing.