ER dH
LG
Defrost Heater / Defrost System Failure
Refrigerator shows dH or ER dH; ice maker area has heavy frost and ice production is reduced.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Defrost heater open, Defrost thermostat (bimetal) stuck open, Defrost sensor (thermistor) out of range, Main control board not initiating defrost
How to Fix / Troubleshooting
Safety: Disconnect power before accessing internal panels. Risk of electric shock and sharp metal edges.
- Visual inspection: Remove freezer rear panel to inspect the evaporator coil. If it is completely encased in ice, the defrost system is not working properly.
- Manual defrost: Unplug the unit and allow all ice to melt (12–24 hours). Place towels to absorb water. This will temporarily restore cooling and ice production.
- Check heater continuity: With a multimeter and power off, test the defrost heater for continuity. Replace if open.
- Check defrost thermostat: Test the defrost thermostat/bimetal for continuity when cold (should be closed). Replace if open when frosty.
- Thermistor check: Inspect the defrost/evaporator thermistor for secure mounting and intact wiring. Replace if resistance is out of spec.
- Control board: If heater and sensors are good, the main PCB may not be initiating defrost cycles and may require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Defrost Heater
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