Defrost heater not operating - F DEF ERROR or R DEF ERROR

What does DEF Heater not operating mean?

If the freezer (F DEF Heater) or Refrigerator (R DEF Heater) defrost heaters are not operating correctly, it can lead to error messages and impaired defrosting. This can be caused by issues with the heater, bimetal component, wiring, or sensors.

• Defrost heater failure (disconnection or open circuit).
• Faulty bimetal component.
• Wiring connection issues.
• Defrost sensor malfunction (e.g., short or open trouble).
• Issue with connection terminal of Main PCB part.

Click steps to track your progress.

1. 1

   Select the self-diagnostic function to detect the specific error of the defrost heater (F DEF ERROR, R DEF ERROR).

2. 2

   Check the resistance values of the F DEF Heater and R DEF Heater at CN72 as described in the manual.

3. 3

   Check the defrost sensor by self-diagnostic function.

4. 4

   Inspect connection terminals of the Main PCB for any issues.

5. 5

   If issues persist, components like the bimetal, heater, or sensor may need replacement.