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er dh
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LG · Refrigerators
Defrost Heater Error
Quick Answer
Error code Er dH on your LG Refrigerators means: Defrost Heater Error. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
LRDCS2603SLRFXS2503SLRMVC2306SLRMVS3006SLRSOS2706SLRSXS2706VLTCS20020S
Likely Causes
  1. Defrost heater element has burned out or has an open circuit
  2. Defrost thermostat (bi-metal) is stuck open and not allowing current to flow to the heater
  3. Wiring to the defrost heater is damaged
  4. Main control board defrost relay has failed
  5. Defrost timer or adaptive defrost control is not initiating defrost cycles
How to Fix It
1
Unplug the refrigerator and remove the freezer rear panel to access the evaporator and defrost heater
2
If there is heavy ice buildup on the evaporator, manually defrost with towels and a hair dryer on low setting
3
Disconnect the defrost heater and test it with a multimeter for continuity; it should show low resistance, typically 20 to 40 ohms
4
Test the defrost thermostat for continuity at room temperature — it should be closed (continuity) when cold
5
If both the heater and thermostat test good, the main control board defrost circuit may need replacement
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Defrost heater assembly (LG part #5300JB1092A)
Defrost thermostat/bi-metal (LG part #6615JB2005H)
Main control board (model-specific)
Related Error Codes
Er IFEr FFEr CFEr COEr rS
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