LG Refrigerator Error Code dH

The dH code means the refrigerator's defrost system failed to complete a defrost cycle properly. The defrost sensor did not reach 8°C within 2 hours of the defrost cycle starting, which tells the control board that the heater is not generating heat. This is most commonly caused by a failed defrost heater element, a blown thermal fuse, or a disconnected wiring connector in the defrost circuit. The code only appears after the full 2-hour defrost window has elapsed.

A power reset may temporarily clear the code from the display, but the error will return if the underlying defrost system fault is not repaired. Because the code only triggers after a full failed 2-hour defrost cycle, it will reappear the next time the defrost cycle runs and fails again. The root cause, such as a faulty heater or blown fuse, must be diagnosed and corrected to resolve the error permanently.

Repair costs vary depending on which component has failed. A thermal fuse is a relatively inexpensive part, with the component itself typically ranging from a few dollars to around $20, while a defrost heater element may cost between $20 and $60 for the part. If you hire a technician, expect to add labor charges on top of parts costs, which can bring the total repair into the range of $100 to $250 or more depending on your location and the specific model.

Start by checking the defrost heater, thermal fuse, and all connectors in the defrost circuit. Use a multimeter to test both the heater element and the thermal fuse for continuity. A reading of no continuity on either component means it has failed and needs to be replaced. If the connectors appear loose or corroded, reseat or clean them and recheck operation.

The dH error itself does not represent an immediate safety hazard, but it does indicate the freezer is not defrosting correctly. Over time, frost will accumulate on the evaporator coils and restrict airflow, which will progressively reduce cooling performance in both the freezer and fresh food sections. Food spoilage becomes a risk if the defrost problem is left unaddressed for an extended period.