LG Refrigerator Error Code r dH

The r dH code means the refrigerator compartment defrost cycle has failed. The defrost sensor did not detect a temperature rise above 40°F (5°C) within 50 minutes of the defrost cycle starting. This points to a problem in the defrost circuit, most commonly a blown thermal fuse, a failed defrost heater, a bad heater relay, or a clogged drain.

Continued use with an active r dH error is not recommended for long-term food safety. Without a functioning defrost cycle, frost will accumulate on the evaporator coils until airflow is blocked, which causes the refrigerator to lose cooling ability. Food temperatures may rise into unsafe ranges over time, so the issue should be addressed promptly.

Repair costs vary depending on which component has failed. Replacing a thermal fuse or defrost heater is generally on the lower end of the cost range, typically between $80 and $200 including parts and labor. A control board relay issue or full board replacement can push costs higher, often in the $150 to $400 range. Getting a specific diagnosis before authorizing parts replacement is the best way to avoid unnecessary expense.

Some steps are DIY-friendly, such as inspecting and cleaning a blocked defrost drain or checking the door gasket for damage. Testing the thermal fuse and defrost heater for continuity and resistance requires a multimeter and basic familiarity with appliance wiring. Replacing the heater or fuse is a moderate-difficulty repair, but if the issue is a faulty relay on the control board, a technician is typically better suited to handle that diagnosis and repair.

A reset may temporarily clear the displayed code, but it will not fix the underlying hardware problem. The error will return the next time the defrost cycle runs and the sensor again fails to reach 40°F within 50 minutes. The root cause, whether a blown fuse, failed heater, bad relay, or blocked drain, must be diagnosed and corrected for the error to clear permanently.