Error Code F dH

Defrosting failure

Also displayed as: F dH

How to Fix

1. 1

   Check door gasket for damage or gaps that allow warm air infiltration; if damaged, replace the door gasket.

2. 2

   With power OFF, measure defrost heater resistance at test points (1) to (2); expected 42 to 50 Ohm. If open/infinite, replace defrost heater.

3. 3

   With power OFF, measure Fuse-M resistance at test points (1) to (2); expected 0 to 0.1 Ohm. If open/infinite, replace Fuse-M (thermal cutout).

4. 4

   Measure defrost sensor resistance at CON8 26th Pin to 25th Pin. If open, the sensor is defective; replace defrost sensor.

5. 5

   Enter Test Mode 1 (press TEST button once): Measure voltage at CON9 5th Pin to 13th Pin; expected 0V in Test Mode 1.

6. 6

   If Test Mode 1 voltage is not 0V, replace the Main PCB.

7. 7

   Enter Test Mode 3 (press TEST button 3 times for forced defrost): Measure voltage at CON9 5th Pin to 13th Pin; expected 112 to 116V.

8. 8

   If Test Mode 3 voltage is correct but heater does not heat, replace the defrost heater assembly.

9. 9

   If Test Mode 3 voltage is not present, replace the Main PCB.

10. 10

    Check drain tube for ice or debris blockage; clear if blocked.