Er tH
LG Refrigerator
Severity: CriticalWhat Does This Error Mean?
The Er tH error means your LG refrigerator's defrost heater has a fault. The heater that melts ice off the evaporator coils is not working properly. Without it, ice will build up and block airflow — causing the fridge to warm up.
Affected Models
- LRMVS3006S
- LRFXS2503S
- LRFDS3006S
- Most LG French door and bottom-freezer refrigerators
Common Causes
- Defrost heater element has burned out
- Defrost thermostat (thermal limiter) has failed and won't allow the heater to activate
- Defrost control on the main board has a fault
- Wiring to the defrost heater is loose or broken
- Heavy ice buildup preventing proper heat transfer from the heater
How to Fix It
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First, do a manual defrost to clear any ice buildup.
Unplug the fridge, open the doors, and let ice melt for 6–12 hours. Absorb water with towels.
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Once defrosted, plug the fridge back in.
Allow 4–6 hours and check if the error returns.
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If Er tH comes back within a few days, the defrost heater system needs repair.
The ice will build up again because the heater isn't running the defrost cycle.
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Check that the freezer isn't packed too tightly with food.
Overpacking blocks airflow and makes ice buildup worse.
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Contact LG support or a certified technician to replace the defrost heater.
Ask them to also test the defrost thermostat and the defrost control timer.
When to Call a Professional
Defrost heater replacement requires removing the freezer's back panel. This is a moderately complex repair that is best done by a certified technician. Expect costs of $150–$320 including parts and labor. Contact LG support or a qualified appliance technician.
Frequently Asked Questions
What happens if I ignore the Er tH error on my LG refrigerator?
Ice will continue building up on the evaporator coils. Eventually, the airflow will be fully blocked and the fridge will stop cooling. Food will spoil. Fix this promptly.
How often does the LG refrigerator defrost heater run?
Typically, the defrost heater runs automatically every 6–12 hours. Each defrost cycle lasts about 20–30 minutes. If the heater fails, ice builds up between defrost cycles until the coils are completely blocked.
How much does a defrost heater cost for an LG refrigerator?
Heater parts typically cost $30–$80 depending on the model. With professional labor, total repair is $150–$320. The defrost thermostat is also worth replacing at the same time — it's cheap insurance.