How do I fix error code F dH on a LG refrigerators?

1. undefined: Check door gaskets for damage. If gasket is damaged: replace door gasket and retest. 2. undefined: Measure defrost heater resistance at CON9 pins 5 to 13 in TEST MODE 3 (push test button 3 times). Expected voltage: 112V–116V. 3. undefined: If voltage is 112–116V: check defrost control part (Fuse-M and heater resistance). Fuse-M resistance should be 0Ω. Defrost heater resistance should be 62–70Ω (F1-DEF-HTR, part 1) and 144–167Ω (F2-DEF-HTR, part 2). 4. undefined: If Fuse-M or heater resistance is out of spec (42–50Ω combined): replace Fuse-M or defrost heater assembly. 5. undefined: If voltage is 0V in TEST MODE 3: enter TEST MODE 1 (push test button 1 time) and measure voltage at CON9 pins 5 to 13. If OV: replace Main PCB. 6. undefined: Check defrost sensor resistance at CON8 pins 26 to 25. If OL or reading above 22kΩ indicating sensor is not at expected temperature: replace defrost sensor. 7. undefined: If all components test good: replace the product (sealed system issue may be preventing proper defrost).

LG Refrigerators

Error Code F dH

Defrost heater error / defrosting failure

Moderate

Address soon - your appliance may not work properly

How to Fix

1
Check door gaskets for damage. If gasket is damaged: replace door gasket and retest.
2
Measure defrost heater resistance at CON9 pins 5 to 13 in TEST MODE 3 (push test button 3 times). Expected voltage: 112V–116V.
3
If voltage is 112–116V: check defrost control part (Fuse-M and heater resistance). Fuse-M resistance should be 0Ω. Defrost heater resistance should be 62–70Ω (F1-DEF-HTR, part 1) and 144–167Ω (F2-DEF-HTR, part 2).
4
If Fuse-M or heater resistance is out of spec (42–50Ω combined): replace Fuse-M or defrost heater assembly.
5
If voltage is 0V in TEST MODE 3: enter TEST MODE 1 (push test button 1 time) and measure voltage at CON9 pins 5 to 13. If OV: replace Main PCB.
6
Check defrost sensor resistance at CON8 pins 26 to 25. If OL or reading above 22kΩ indicating sensor is not at expected temperature: replace defrost sensor.
7
If all components test good: replace the product (sealed system issue may be preventing proper defrost).