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LG·refrigeratorhigh severity
LG Error Code Er dH
Defrost heater error
Common Causes
- 1Heater failure
- 2Relay issue
The defrost heater operates at 120V AC. Always unplug the refrigerator before accessing the heater assembly. Never use a heat gun or torch to clear ice near the evaporator — the refrigerant lines can be punctured.
Step-by-Step Troubleshooting
- 1
Remove the freezer rear panel to access the defrost heater glass tube assembly mounted along the evaporator coils
- 2
Disconnect the heater leads and measure resistance — a functioning LG defrost heater reads between 20-40 ohms; open circuit means the heater element has burned out
- 3
Inspect the heater glass tube for visible cracks, dark spots, or separation from the mounting clips
- 4
Check the defrost relay on the main control board — if the relay tests OK but the heater has no power during defrost, the board timer circuit has failed
- 5
Verify the bi-metal thermostat (defrost termination switch) is not permanently open, which would interrupt the heater circuit
Pro Diagnostic Tip
LG uses adaptive defrost that activates based on compressor run hours, not a fixed timer. If you see Er dH on a unit that has been recently moved or lost power, the adaptive defrost counter may have reset and triggered an immediate defrost cycle on a cold heater — wait 24 hours and retest before replacing parts.
You Might Also Notice
- •Thick ice sheet on freezer rear wall
- •Freezer temperature rising above 10F
- •Fresh food section getting warm
- •Water leak from bottom of freezer compartment
Parts, Cost & Difficulty
Repair Difficulty
Hard — Advanced Skills RequiredEstimated Repair Cost
$180–$350
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
ACM73720205 (Defrost Heater)MEE62805003 (Defrost Heater Assembly)EBR84433501 (Main Board — if relay failed)
Do You Have the Right Tools?
Refrigerant gauges ($200+), vacuum pump ($250), leak detector ($150), and EPA-certified recovery equipment. Our technician arrives with $15K+ in professional tools — your diagnostic is free.
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Refrigerant (R-134a/R-600a) requires EPA certification to handle. Improper discharge is a federal violation and health hazard. Our techs are licensed and insured — let them handle the risk.
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Get Professional Help Now
Error code Er dH is a high-severity issue that can cause further damage to your refrigerator if left unresolved. A licensed technician can diagnose and fix it the same day.
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Frequently Asked Questions
What does LG error code Er dH mean?
LG error code Er dH indicates: Defrost heater error. This is a high-severity issue affecting your refrigerator.
How do I fix LG error code Er dH?
Remove the freezer rear panel to access the defrost heater glass tube assembly mounted along the evaporator coils Then, Disconnect the heater leads and measure resistance — a functioning LG defrost heater reads between 20-40 ohms; open circuit means the heater element has burned out Then, Inspect the heater glass tube for visible cracks, dark spots, or separation from the mounting clips There are 2 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my refrigerator has error Er dH?
Besides the error code on the display, common signs include: Thick ice sheet on freezer rear wall; Freezer temperature rising above 10F; Fresh food section getting warm. If you notice any of these symptoms, check your refrigerator's display panel for error code Er dH.
How much does it cost to fix LG Er dH?
Repair costs for LG Er dH typically range from $180 to $350 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.