Er tF
LG Refrigerator
Severity: ModerateWhat Does This Error Mean?
The Er tF error means your LG refrigerator's freezer thermistor (temperature sensor) is reading out of range. The sensor cannot accurately measure the freezer compartment temperature. If ignored, food in the freezer may not be kept at a safe temperature.
Affected Models
- LRMVS3006S
- LRFXS2503S
- LRFDS3006S
- Most LG French door and bottom-freezer refrigerators
Common Causes
- Freezer thermistor has failed and is giving incorrect resistance readings
- Wiring to the thermistor is loose or has corroded
- Freezer temperature is extremely cold or warm causing a sensor out-of-range reading
- Ice buildup near the thermistor insulating it from accurate readings
- Main control board not interpreting the thermistor signal correctly
How to Fix It
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Unplug the refrigerator for 60 seconds.
A reset can clear temporary out-of-range sensor errors.
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Check the freezer temperature setting.
Set the freezer to 0°F (-18°C) if it has been changed. Extreme settings can cause sensor errors.
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Check inside the freezer for excessive ice buildup near the back wall.
Ice around the thermistor affects its readings. A manual defrost may resolve the error.
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If the error persists, the thermistor needs testing.
A technician tests the resistance of the sensor — it should change with temperature. A fixed reading means failure.
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Replace the thermistor if confirmed faulty.
It's a small, inexpensive part but must be the correct part number for your model.
When to Call a Professional
Thermistor replacement is a straightforward repair once the correct part is confirmed. A technician can test the thermistor quickly with a multimeter. Expect repair costs of $90–$220 including parts and labor. Contact LG support or a certified appliance technician.
Frequently Asked Questions
Is Er tF dangerous for my frozen food?
It can be. If the sensor is not reading correctly, the fridge can't regulate freezer temperature properly. The freezer may run too warm, thawing food, or too cold, wasting energy. Check the actual temperature inside the freezer with a thermometer.
How do I test my LG freezer thermistor myself?
You need a multimeter and the resistance chart for your specific thermistor. At 32°F (0°C), most LG thermistors read around 10,000–16,000 ohms. If the reading is stuck at 0 or shows open circuit — the thermistor has failed.
How much does an LG freezer thermistor replacement cost?
The thermistor part typically costs $15–$40. With professional labor, total repair is $90–$220. It's one of the most affordable refrigerator sensor repairs.