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

1. undefined: Inspect door gasket for damage or gaps. If damaged, replace door gasket. 2. undefined: With power off, measure defrost heater resistance at CON9 pins 5-13 (TEST MODE 1). Expected: 42-50 ohm (combined). If heater resistance is not 42-50 ohm, check Fuse-M continuity (should be 0-0.1 ohm); if Fuse-M is open, replace Fuse-M. 3. undefined: Individual heater resistances: Sheath heater (1) = 62-70 ohm; Defrost heater (2) = 144-167 ohm. Measure each individually if combined reading is wrong. 4. undefined: Measure defrost sensor (FD-SNR) resistance at CON8 pins 26-25. Expected ~22k at room temp per table. If open or wildly out of range, replace defrost sensor. 5. undefined: Enter TEST MODE 3 (press test button 3 times) to force defrost. Check heater voltage at CON9 pins 5-13. Expected: 112V-116V AC. If voltage is not present, replace main PCB. 6. undefined: Enter TEST MODE 1 (press test button 1 time). Check heater voltage at CON9 pins 5-13. Expected: 0V (heater off in compressor mode). If voltage is not 0V, replace main PCB. 7. undefined: If heater voltage is correct in both modes and heater/fuse resistance is correct, check drain tube for blockage and clear it.

LG Refrigerators

Error Code F dH

Defrosting failure — defrost sensor did not reach 41°F (5°C) within 80 minutes

Moderate

Address soon - your appliance may not work properly

How to Fix

1
Inspect door gasket for damage or gaps. If damaged, replace door gasket.
2
With power off, measure defrost heater resistance at CON9 pins 5-13 (TEST MODE 1). Expected: 42-50 ohm (combined). If heater resistance is not 42-50 ohm, check Fuse-M continuity (should be 0-0.1 ohm); if Fuse-M is open, replace Fuse-M.
3
Individual heater resistances: Sheath heater (1) = 62-70 ohm; Defrost heater (2) = 144-167 ohm. Measure each individually if combined reading is wrong.
4
Measure defrost sensor (FD-SNR) resistance at CON8 pins 26-25. Expected ~22k at room temp per table. If open or wildly out of range, replace defrost sensor.
5
Enter TEST MODE 3 (press test button 3 times) to force defrost. Check heater voltage at CON9 pins 5-13. Expected: 112V-116V AC. If voltage is not present, replace main PCB.
6
Enter TEST MODE 1 (press test button 1 time). Check heater voltage at CON9 pins 5-13. Expected: 0V (heater off in compressor mode). If voltage is not 0V, replace main PCB.
7
If heater voltage is correct in both modes and heater/fuse resistance is correct, check drain tube for blockage and clear it.