LG Refrigerator Er dH — Defrost Heater Fault
LG Refrigerator · Error code Er dH
What Er dH Means
Er dH (Defrost Heater error) means the defrost cycle did not raise the evaporator temperature as expected — usually a failed defrost heater, sensor, or control.
Most Likely Fix
Defrost heater circuit error
Tools: screwdriver, nut driver, multimeter
Diagnose first: Open defrost heater or a failed bimetal thermostat is most common; both live behind the freezer evaporator panel.
Find this part on Amazon →If the primary fix doesn't resolve it:
Symptoms
- Heavy frost on the back panel
- Poor cooling
- Er dH on the display
Common Causes
An open defrost heater never melts the frost off the coils.
A bad bi-metal/sensor prevents proper defrost.
How to Fix It
- Unplug and remove the freezer back panel to access the evaporator.
- Test the defrost heater for continuity.
- Test the defrost thermostat/sensor.
- Replace the failed component and clear the frost.
Parts You May Need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
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Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.