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

1. undefined: Check door gasket for damage. If damaged: replace door gasket. 2. undefined: Enter Test Mode 3 (push test button 3 times). Measure heater voltage at CON9 pins 5th~13th. Should be 112~116V. 3. undefined: If heater voltage is correct (112~116V): check defrost control part (Fuse-M and heater resistance). 4. undefined: Check Fuse-M resistance at CON9 pins 5th~13th. Should be 42~50 Ohm. If out of range: replace Fuse-M/defrost control assembly. 5. undefined: Check defrost sensor resistance at CON8 26th~25th pins vs. temperature table. Sensor at 23°F/-5°C = 38k Ohm, at 32°F/0°C = 30k Ohm, at 41°F/5°C = 24k Ohm, at 50°F/10°C = 19.5k, at 59°F/15°C = 16k. 6. undefined: If defrost sensor is open (infinite at room temp) or above 22kOhm when should be lower: replace defrost sensor. 7. undefined: Enter Test Mode 1 (push test button 1 time). Measure heater voltage at CON9 5th~13th pin. Should be 0V. 8. undefined: If voltage in Test Mode 1 is not 0V: replace Main PCB. 9. undefined: If all components check out but defrost still fails: explain to customer (check for blocked drain tube).

LG Refrigerators

Error Code F dH

Defrosting failure - defrost heater error

Moderate

Address soon - your appliance may not work properly

How to Fix

1
Check door gasket for damage. If damaged: replace door gasket.
2
Enter Test Mode 3 (push test button 3 times). Measure heater voltage at CON9 pins 5th~13th. Should be 112~116V.
3
If heater voltage is correct (112~116V): check defrost control part (Fuse-M and heater resistance).
4
Check Fuse-M resistance at CON9 pins 5th~13th. Should be 42~50 Ohm. If out of range: replace Fuse-M/defrost control assembly.
5
Check defrost sensor resistance at CON8 26th~25th pins vs. temperature table. Sensor at 23°F/-5°C = 38k Ohm, at 32°F/0°C = 30k Ohm, at 41°F/5°C = 24k Ohm, at 50°F/10°C = 19.5k, at 59°F/15°C = 16k.
6
If defrost sensor is open (infinite at room temp) or above 22kOhm when should be lower: replace defrost sensor.
7
Enter Test Mode 1 (push test button 1 time). Measure heater voltage at CON9 5th~13th pin. Should be 0V.
8
If voltage in Test Mode 1 is not 0V: replace Main PCB.
9
If all components check out but defrost still fails: explain to customer (check for blocked drain tube).