LG Refrigerator Error Code Er rS — How to Fix (Refrigerator sensor error) (2026)

Understanding LG Refrigerator Error Er rS

The LG Refrigerator Error Er rS signals that the temperature‑monitoring circuit isn’t behaving as expected. Inside every LG fridge, a thermistor (often called the “temperature sensor”) sits on the evaporator coil. The control board polls this sensor every few seconds; if the voltage it receives is out of the calibrated range, the board flags Er rS and may shut the compressor off to protect the system. Homeowners typically notice the error when the digital panel flashes “Er rS” or when the fridge stops cooling altogether. Because the sensor directly influences the compressor’s duty cycle, an unresolved error can lead to food spoilage and higher energy bills.

Quick Check

Before opening any panels, try the simplest remedy:

1. Power cycle – Unplug the unit for one minute, then plug it back in.
2. Reset button – Some LG models have a small reset hole near the temperature controls; press it with a paperclip for five seconds.

If the error clears, you’ve likely dealt with a momentary glitch. If it returns, move on to the detailed diagnosis.

Symptoms You’ll Notice

• Error display – “Er rS” appears on the LCD or LED panel, often accompanied by a blinking icon.
• Loss of cooling – The refrigerator or freezer compartments stay at ambient temperature, sometimes while the compressor hums but never starts.
• Unusual noises – A rapid clicking sound may be heard as the control board repeatedly tries to start the compressor.
• Ice maker inactivity – Models with an ice maker may stop producing cubes because the board thinks the freezer is too warm.

These signs point directly to a sensor‑related fault, but they can also mask other issues such as a failing control board or a blocked condenser.

Root Causes

• Thermistor failure – Age, moisture ingress, or a manufacturing defect can cause the sensor’s resistance to drift outside the acceptable range.
• Loose or corroded wiring – The humid interior can oxidize connectors, leading to intermittent signals.
• Control board misinterpretation – A firmware glitch or voltage spike may make the board think the sensor is bad even when it isn’t.
• Improper sensor placement – A previous service may have installed the sensor too far from the coil, giving inaccurate readings.
• Physical damage – Accidental impact while loading heavy items can crack the sensor housing.

Step‑by‑Step Repair

Safety first: Always disconnect power before working inside the refrigerator. Wear insulated gloves and keep water away from electrical components.

1. Quick Power Reset

Refer to the “Quick Check” section. This clears temporary faults and is the safest first step.

2. Locate the Temperature Sensor

Open the freezer door, remove the rear interior panel using a Phillips #2 screwdriver, and find the cylindrical sensor mounted on the evaporator coil. It’s usually labeled “TS” or “Temp Sensor.” Take a photo of the wiring before you disconnect it.

3. Inspect Wiring and Connector

With the power still off, examine the sensor’s harness for frayed wires, corrosion, or loose pins. Use a flat‑head screwdriver (3 mm) to gently pry any stuck connectors. Replace the harness if you notice any damage.

4. Test Sensor Resistance

Set a digital multimeter to the lowest ohms range. Disconnect the sensor plug, then place the probes on the two terminals. At room temperature, a healthy sensor reads 2 kΩ–4 kΩ. Anything significantly higher (open circuit) or lower (short) indicates a defective sensor.

5. Replace the Faulty Sensor

If the sensor fails the resistance test, remove the mounting screw (typically a #6‑32 machine screw) and pull the sensor out. Install the new temperature sensor (thermistor), tighten the screw, and reconnect the wiring harness. Apply a thin layer of dielectric grease to the connector pins to protect against moisture.

6. Reassemble and Verify

Replace the interior panel, secure it with the original screws, and restore power. The refrigerator should run a self‑diagnostic; the Er rS code should clear within a few minutes. Listen for the compressor’s start‑up and feel for cool air after 10‑15 minutes.

Pro Tip: If the error persists after installing a new sensor, re‑check the connector polarity and ensure the sensor contacts the coil surface evenly. An uneven gap can cause false temperature readings.

Model‑Specific Notes

• LG French‑Door (LSXS26366) – The sensor is located behind the freezer crisper drawer; you may need to remove the drawer and a plastic cover before accessing the coil.
• LG Side‑by‑Side (LFXS26973) – Some units use a T20 Torx screw for the sensor mount; keep the appropriate bit handy.
• LG Top‑Freezer (LTCS24223) – The sensor is attached to a plastic bracket that can break if forced. Use gentle prying to avoid damaging the bracket.

If you own a different model, consult the user manual’s service section for the exact sensor location.

Common Mistakes to Avoid

• Skipping the power disconnect – Working on a live refrigerator can cause electric shock or damage the control board.
• Measuring resistance with the sensor still connected to the board – This can give misleading readings because the board adds parallel resistance.
• Forgetting dielectric grease – Moisture can quickly corrode the connector, leading to repeat failures.
• Over‑tightening the mounting screw – Stripping the screw hole can make future sensor removal difficult.

Repair Cost Estimate

LG’s limited one‑year warranty covers defects in the sensor and control board, but only if the unit is still under warranty and the repair is performed by an authorized service provider. Keep your purchase receipt and note the serial number; you’ll need it when you call support.

Preventive Maintenance Tips

• Clean the condenser coils every 6‑12 months to keep the compressor running efficiently; a hot compressor can stress the sensor circuit.
• Check door seals for leaks; a tight seal prevents warm air from entering, reducing sensor strain.
• Avoid water splash on the interior panel when loading heavy containers; moisture can seep into connectors over time.
• Run a diagnostic mode quarterly (see the optional step above); early detection of minor sensor drift can prevent full‑scale errors.
• Inspect the sensor wiring during routine coil cleaning; look for nicks or corrosion before they cause a fault.

Warranty & Support

LG offers a 1‑year limited warranty on most refrigerator components, including the temperature sensor and control board. For out‑of‑warranty service, call LG Customer Care at 1‑800‑243‑0000. Have your model number and serial number ready. You can also schedule a technician through the official LG website: https://www.lg.com/us/support/contact‑us.

If you prefer a visual guide, check out the troubleshooting videos on the LG YouTube channel or consult a local appliance repair shop.

Related Errors on Other Brands (For Comparison)

• Bosch Dishwasher Error E01 – Indicates a water‑fill problem that can also trigger sensor‑related codes.
• Bosch Dishwasher Error E09 – Shows a heating‑element fault, illustrating how control boards interpret sensor data across appliances.

Seeing how other manufacturers handle sensor faults can give you a broader perspective on diagnostic strategies.

Frequently Asked Questions

Q: Can I use a generic sensor instead of an OEM part? A: Generic thermistors often work, but they may have a different resistance curve, leading to inaccurate temperature readings. OEM parts are recommended for reliable performance.

Q: My fridge still shows Er rS after I replaced the sensor. What next? A: Verify the sensor’s orientation, re‑measure resistance, and inspect the control board for burnt traces. At this point, contacting an authorized LG technician is advisable.

Q: Is the error code stored in memory after a reset? A: Yes, the control board retains the last fault for a short period. After a successful reset, the code should disappear within a few minutes of normal operation.

Quick Reference Table

By following this guide, most homeowners can diagnose and fix the LG Refrigerator Error Er rS without a costly service call. Keep this page bookmarked for future reference, and enjoy a reliably cool fridge once more.

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