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Error code reference

LG Refrigerator Error Code rS E

Refrigerator sensor error

LG codesLG refrigerator codes

Refrigerator sensor error – the refrigerator temperature sensor has a short, open, or out-of-range resistance reading.

First step from the service manual

Check for loose connection at CON7 on the Main PCB.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What rS E means on a LG refrigerator

The rS E error code on an LG refrigerator indicates a fault in the refrigerator compartment temperature sensor circuit. This thermistor is responsible for continuously reporting the internal temperature of the fresh food section to the Main PCB, allowing the control board to regulate compressor and fan operation. When the PCB detects a resistance reading that falls outside the expected range, or reads a short or open circuit condition in the sensor loop, it triggers the rS E fault to alert the technician that accurate temperature monitoring has been compromised.

The sensor itself is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases as temperature rises. A short circuit drives the resistance abnormally low, while an open circuit produces an infinitely high reading. Either condition causes the control board to lose confidence in the temperature data, which can result in erratic cooling behavior or a complete shutdown of normal refrigeration cycles. The first diagnostic step is to inspect the sensor wiring harness connection at CON7 on the Main PCB, as loose or corroded connector pins at this junction are a frequent source of intermittent or persistent faults.

If the connector at CON7 is secure and undamaged, the next focus shifts to the sensor itself and the wiring harness running from the sensor to the board. Physical damage to the harness, moisture intrusion at the connector, or a failed thermistor element can all produce out-of-range readings. Resistance testing of the sensor at a known temperature can confirm whether the thermistor is within specification before condemning the part.

Source: manufacturer service documentation.

Common causes of rS E

  1. 01

    Loose or corroded connection at CON7 on the Main PCB

    Wiring / connection

    The wiring harness connector at CON7 is the first point to inspect. A loose pin, corroded terminal, or partially unseated connector can interrupt the sensor signal and trigger the fault without any component actually failing.

  2. 02

    Failed refrigerator compartment thermistor

    Part replacement

    The NTC thermistor element inside the sensor can fail open or short internally, producing a resistance reading outside the acceptable range. Resistance testing the sensor at a known ambient temperature will confirm whether the thermistor itself is defective.

  3. 03

    Damaged or pinched wiring harness

    Part replacement

    The wiring between the thermistor and CON7 on the Main PCB can be pinched, chafed, or broken, especially along routing points near shelving brackets or the rear wall. Visually inspect the full harness length for any damage to the insulation or wire strands.

  4. 04

    Moisture or ice buildup at the sensor connector

    Wiring / connection

    Condensation or frost accumulation around the sensor connector can cause intermittent shorts or elevated resistance. If the connector shows signs of moisture intrusion or corrosion on the terminals, cleaning and sealing the connector may resolve the fault.

  5. 05

    Faulty Main PCB

    Part replacement

    If the thermistor resistance checks out correctly and the wiring harness and connector are intact, the Main PCB itself may be misreading the sensor signal due to a damaged input circuit. This is the least likely cause and should only be considered after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about rS E

What does rS E mean on a LG refrigerator?
The rS E code indicates a refrigerator compartment temperature sensor error. The Main PCB has detected that the sensor circuit is reading a short, open, or out-of-range resistance value. This means the control board cannot reliably monitor the fresh food section temperature, which can affect how the refrigerator cools. A loose connection at CON7 on the Main PCB is the most common starting point for diagnosis.
Can I fix the rS E error myself, or do I need a technician?
A homeowner comfortable working around appliances can safely check for a loose wiring connector at the Main PCB, which resolves the fault in many cases. However, resistance testing the thermistor, inspecting the full wiring harness, and replacing components typically requires basic electrical knowledge and a multimeter. If you are not comfortable working inside the refrigerator's control compartment, a qualified appliance technician is recommended.
Is it safe to keep using my refrigerator while the rS E code is displayed?
Operating the refrigerator with an active rS E code carries risk because the control board cannot accurately monitor compartment temperature. Food safety may be compromised if the refrigerator overcools, undercools, or cycles incorrectly as a result of the missing sensor data. It is best to address the fault promptly and monitor food temperatures closely in the meantime.
How much does it cost to repair the rS E error on an LG refrigerator?
If the repair only requires reseating a loose connector, there may be no parts cost at all, though a service call fee typically applies if a technician is involved. Replacing the thermistor sensor is generally an affordable repair, with parts costs typically ranging from around $15 to $50 depending on the model. If the Main PCB requires replacement, the total repair cost including parts and labor can range from $150 to $400 or more.
Will resetting the refrigerator clear the rS E error code?
Performing a power reset by unplugging the refrigerator for a few minutes may temporarily clear the rS E code, but the fault will return if the underlying cause has not been corrected. A reset is useful for confirming whether the fault is intermittent or persistent, but it is not a fix. The sensor circuit must be inspected and any defective wiring or components must be repaired or replaced for the code to stay clear.

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