LG refrigerators are known for their reliability and smart features, but when an error code appears on the display, it can be frustrating — especially when it interrupts daily use. One of the more common issues users encounter is the “Er dH” error code, which indicates a defrost malfunction. This usually means your refrigerator is struggling to melt the frost that naturally accumulates on the evaporator coils inside the freezer. If not addressed, this issue can lead to cooling problems and even frost buildup that blocks airflow.
What the Er dH Error Code Means
When your refrigerator shows the Er dH code, it’s alerting you that the defrost system isn’t working as expected. The defrost heater, thermistor, or defrost control board might not be functioning properly. These components work together to regulate temperature and prevent frost from accumulating on the coils.
When the defrost cycle fails, you might notice:
- Ice buildup in the freezer compartment.
- Warm spots in the fridge section.
- Water leaking inside or under the refrigerator after partial melting.
- The fridge running continuously or making unusual clicking noises.
Understanding these symptoms helps you identify the issue early before it escalates.
Common Causes of the Er dH Error
The defrost process is controlled by a few key components. When one fails, the system stops working correctly. The most frequent causes include:
- Faulty Defrost Heater – If the heating element burns out, the ice on the coils won’t melt, leading to frost accumulation.
- Defective Defrost Thermistor – This sensor monitors coil temperature during the defrost cycle. A damaged thermistor can give incorrect readings.
- Malfunctioning Defrost Control Board – The control board sends power to the heater and manages timing. If it fails, the defrost cycle won’t start.
- Loose or Damaged Wiring – Broken or corroded connections can interrupt communication between components.
DIY Troubleshooting — Step by Step
Before calling a technician, you can perform a few safe, simple checks to confirm the issue.
- Unplug the Refrigerator
Always disconnect power before inspecting internal parts to ensure safety. - Inspect the Defrost Heater
The heater is usually located near or behind the evaporator coils. Look for visible signs of damage or a burnt element. If it appears damaged, it will likely need replacement. - Check the Defrost Thermistor
Examine the small sensor near the coils. Ensure its wiring is intact and the connector isn’t loose. If the thermistor is reading inaccurate temperatures or appears damaged, replace it. - Examine the Control Board
Access the back panel and visually check the board for burnt marks, corrosion, or broken solder joints. A faulty board will prevent the heater from activating during the cycle. - Try Manual Defrosting
Sometimes, a temporary manual defrost can help. Unplug the fridge and leave the doors open for several hours to melt built-up ice. Once fully defrosted, plug it back in and monitor its operation. If the error returns, electrical components likely need replacement.
Preventive Measures
Once you fix the issue, a few maintenance habits can help prevent the Er dH code from returning:
- Keep the freezer vents clear to maintain proper airflow.
- Avoid overloading the refrigerator, which can restrict air circulation and cause uneven cooling.
- Clean the door seals regularly to ensure they close tightly and prevent moisture from entering.
- Periodically check the drain and air passages to make sure they’re not blocked by ice.
- Schedule regular cleaning and inspection of the back coils and internal sensors to keep them running efficiently.
Quick Recap for Easy Reference
If your LG refrigerator displays the Er dH error:
- Inspect and test the defrost heater for continuity.
- Check the thermistor and wiring for damage.
- Inspect the control board for faults.
- Perform a manual defrost if needed.
- Replace any failed components with genuine LG parts.
Final Thoughts
The Er dH error code is one of the most common LG refrigerator issues and usually ties back to a defrost system failure. While the repair might sound technical, many homeowners can perform the basic checks themselves. Replacing a faulty heater or sensor is often straightforward with proper care. However, if the issue persists after these steps, it’s best to have a professional technician handle the diagnosis to ensure long-term reliability.