How do I fix error code F dH on my LG LRYKC2606B?

1. undefined: Check door gasket for damage — if damaged, replace door gasket. 2. undefined: Enter Test Mode 1 (push test button 1 time on Main PCB). Check CON9 5th-to-13th-pin voltage: should be 0 V. If not 0 V, replace Main PCB. 3. undefined: Enter Test Mode 3 (push test button 3 times). Check CON9 5th-to-13th-pin voltage: should be 112–116 V. If not in range, replace Main PCB. 4. undefined: Check Fuse-M resistance (pins 1-to-2): should be 0–0.1 Ω. If open (OL), replace Fuse-M. 5. undefined: Check defrost heater resistance: should be 62–70 Ω (42–50 Ω is acceptable range per flowchart). If open or shorted, replace defrost heater assembly. 6. undefined: Check defrost sensor resistance at CON8 26th-to-25th-pin against table. If OL or 22 kΩ at room temperature (normal), sensor is OK. 7. undefined: If heater and fuse check OK but error persists and voltage is correct, explain to customer (door seal issue or environmental factor).

LG LRYKC2606BRefrigerator

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 1 (push test button 1 time on Main PCB). Check CON9 5th-to-13th-pin voltage: should be 0 V. If not 0 V, replace Main PCB.
3
Enter Test Mode 3 (push test button 3 times). Check CON9 5th-to-13th-pin voltage: should be 112–116 V. If not in range, replace Main PCB.
4
Check Fuse-M resistance (pins 1-to-2): should be 0–0.1 Ω. If open (OL), replace Fuse-M.
5
Check defrost heater resistance: should be 62–70 Ω (42–50 Ω is acceptable range per flowchart). If open or shorted, replace defrost heater assembly.
6
Check defrost sensor resistance at CON8 26th-to-25th-pin against table. If OL or 22 kΩ at room temperature (normal), sensor is OK.
7
If heater and fuse check OK but error persists and voltage is correct, explain to customer (door seal issue or environmental factor).