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

1. undefined: Check the door gasket for damage or gaps that could allow warm air infiltration causing excessive frost accumulation. Replace door gasket if damaged. 2. undefined: Enter Test Mode 1 (press Main PCB test button once): measure CON9 Pin 5 ~ Pin 13 voltage. Should be 0V in Test Mode 1 (heater off state). If not 0V, replace Main PCB. 3. undefined: Enter Test Mode 3 (press test button three times): measure CON9 Pin 5 ~ Pin 13 voltage. Should be 112–116V when defrost is forced. If voltage is absent, replace Main PCB. 4. undefined: Measure Fuse-M resistance (CON9 pins): should read 0 Ω. If open (infinite), replace Fuse-M. 5. undefined: Measure defrost heater resistance: F1 heater should be 62–70 Ω; F2 heater 144–167 Ω. Infinite resistance indicates open heater — replace heater assembly. 6. undefined: Measure defrost sensor resistance at CON8 Pin 26 ~ Pin 25: should be approximately 22kΩ at room temperature. If open or shorted, replace defrost sensor. 7. undefined: If all components test good and voltage is present, explain to customer (possible temporary condition from extended door opening).

LG Refrigerators

Error Code F dH

Defrost heater error — defrost sensor did not reach 40°F (5°C) within 80 minutes after defrost start

Moderate

Address soon - your appliance may not work properly

Also displayed as: F dH

How to Fix

1
Check the door gasket for damage or gaps that could allow warm air infiltration causing excessive frost accumulation. Replace door gasket if damaged.
2
Enter Test Mode 1 (press Main PCB test button once): measure CON9 Pin 5 ~ Pin 13 voltage. Should be 0V in Test Mode 1 (heater off state). If not 0V, replace Main PCB.
3
Enter Test Mode 3 (press test button three times): measure CON9 Pin 5 ~ Pin 13 voltage. Should be 112–116V when defrost is forced. If voltage is absent, replace Main PCB.
4
Measure Fuse-M resistance (CON9 pins): should read 0 Ω. If open (infinite), replace Fuse-M.
5
Measure defrost heater resistance: F1 heater should be 62–70 Ω; F2 heater 144–167 Ω. Infinite resistance indicates open heater — replace heater assembly.
6
Measure defrost sensor resistance at CON8 Pin 26 ~ Pin 25: should be approximately 22kΩ at room temperature. If open or shorted, replace defrost sensor.
7
If all components test good and voltage is present, explain to customer (possible temporary condition from extended door opening).

This Error Applies To

LG LRFGC2706S Series Refrigerators

Service manual exact match: LRFGC2706SService manual exact match: LRFGC2706VService manual exact match: LRFGC2706DService manual exact match: LLFGC2706SService manual exact match: LLFGC2706VService manual exact match: LLFGC2706D

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