Er FS
LG Refrigerator
Severity: ModerateWhat Does This Error Mean?
The Er FS error means the freezer temperature sensor in your LG refrigerator has a problem. This sensor monitors how cold the freezer is and helps regulate the compressor. When it fails or reads incorrectly, the freezer may not maintain a safe temperature. This error should be addressed quickly to protect your frozen food.
Affected Models
- LRMVS3006S
- LRFXS2503S
- LRMDC2306S
- LFXS26973S
- Most LG French door and side-by-side refrigerators
Common Causes
- Faulty freezer sensor that has drifted out of calibration range or failed completely
- Frost or ice buildup around the sensor disrupting its temperature reading
- Loose or corroded wiring connection between the sensor and the control board
- Compressor running continuously due to a bad sensor — overworking the cooling system
- Control board fault misinterpreting the signal from the freezer sensor
How to Fix It
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Unplug the refrigerator and leave it unplugged for 10 minutes.
This forces a full power reset of the control board. Sometimes a false Er FS reading clears after a reset.
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Check if there is heavy frost buildup on the back wall of the freezer.
Excessive frost can cover the sensor and give false readings. If frost is heavy, a manual defrost is needed.
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To manually defrost, leave the fridge unplugged with the freezer door open for 24 hours.
Place towels on the floor to catch melting ice. Move food to a cooler with ice during this process.
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Plug the refrigerator back in after defrosting and allow 4–6 hours to reach operating temperature.
Check the display to see if Er FS has cleared. If the error is gone, the frost was covering the sensor.
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If Er FS returns after defrosting in a warm room, the sensor has failed.
Call a technician. Do not continue running the fridge with a bad freezer sensor — food safety is at risk.
When to Call a Professional
If a power reset and manual defrost do not clear Er FS, the freezer sensor needs professional testing. Sensor replacement requires accessing the interior freezer panels. Contact LG support at 1-800-243-0000 or a licensed appliance repair service. Expect repair costs of $120–$250 for a freezer sensor replacement.
Frequently Asked Questions
Will my freezer still stay cold with Er FS showing?
Possibly — but you cannot rely on it. A failed sensor can cause the compressor to run too little or too much. The actual temperature inside may be unsafe even if it feels cold. Use a separate freezer thermometer to check the real temperature. Meat and fish should be at 0°F or below to be safe.
How do I know if my LG fridge needs a manual defrost?
Open the freezer and look at the back wall. If you see a thick layer of frost or ice — more than a quarter inch — the defroster may not be working correctly. Heavy frost buildup often goes hand-in-hand with sensor errors. A manual defrost is safe and costs nothing.
How much does a freezer sensor replacement cost on an LG refrigerator?
The sensor part itself usually costs $20–$60. Labor for accessing and replacing it typically adds $100–$180. Total repair cost is usually $120–$250 depending on your area. Always get a written estimate before authorizing any repair.