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Error code reference

LG Refrigerator Error Code E r2

Refrigerator sensor 2 error

LG codesLG refrigerator codes

Refrigerator sensor 2 error - second refrigerator temperature sensor has a short, open, or out-of-range resistance reading.

First step from the service manual

Check for a loose connection between Main PCB and sensor at CON7 pins 17-18.

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

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What E r2 means on a LG refrigerator

The Er2 error code on an LG refrigerator indicates a fault with the second refrigerator compartment temperature sensor. This sensor is a thermistor, a resistive component whose resistance value changes predictably with temperature. The control system monitors the resistance across this sensor continuously, and when the reading falls outside the expected range, registers as a short circuit, or shows an open circuit condition, the main PCB triggers the Er2 code. This sensor plays a critical role in ensuring accurate temperature regulation inside the fresh food compartment.

The primary diagnostic starting point is the electrical connection between the main PCB and the sensor at connector CON7, specifically pins 17 and 18. A loose, corroded, or damaged connector at this point can produce a false reading that mimics a failed sensor. Before condemning the sensor itself, technicians should inspect this connector carefully for bent pins, moisture intrusion, or incomplete seating. Resistance across the sensor leads can then be measured and compared against the expected thermistor curve for the specific temperature at the time of testing.

Common root causes include a physically damaged sensor due to ice buildup or mechanical contact, wiring harness damage along the routing path from the PCB to the sensor location, or a failed thermistor that has drifted out of specification. Moisture inside the connector housing can cause intermittent shorts or corroded contacts that produce erratic resistance readings. In some cases, the main PCB itself may have a fault on the input circuit for that sensor channel, though this is the least likely cause and should be ruled out after the sensor and wiring have been confirmed good.

Source: manufacturer service documentation.

Common causes of E r2

  1. 01

    Loose or corroded connector at CON7 pins 17-18

    Wiring / connection

    A loose or poorly seated connection at the main PCB connector CON7, pins 17 and 18, is the most frequent trigger for this code. Inspect the connector for incomplete seating, bent pins, or corrosion and reseat it firmly before replacing any components.

  2. 02

    Failed refrigerator thermistor (sensor 2)

    Part replacement

    The thermistor itself may have developed an internal open circuit or short, causing its resistance to fall outside the acceptable range for the measured temperature. Testing the sensor resistance with a multimeter and comparing it to the expected value for the ambient temperature will confirm or rule out this cause.

  3. 03

    Damaged wiring harness

    Part replacement

    The wiring between the main PCB and the sensor can be pinched, chafed, or broken, particularly at points where the harness routes through cabinet walls or around sharp edges. A visual inspection followed by a continuity test on each wire will identify any breaks or shorts to ground.

  4. 04

    Moisture or ice buildup around the sensor

    Wiring / connection

    Ice accumulation in the refrigerator compartment can encase the sensor or its connector, physically damaging the thermistor body or creating a short through standing water. Defrosting the compartment fully and inspecting the sensor housing for cracks or water intrusion is part of the diagnosis process.

  5. 05

    Faulty main PCB sensor input circuit

    Part replacement

    If the wiring and sensor both test within specification, the input circuit on the main PCB corresponding to that sensor channel may have failed. This is the least common cause and should only be considered after all other components have been verified.

See the test procedure for each cause

Frequently asked questions about E r2

What does E r2 mean on a LG refrigerator?
The Er2 code indicates a problem with the second refrigerator compartment temperature sensor. The control board has detected that the sensor is producing a reading consistent with a short circuit, an open circuit, or a resistance value outside the expected range. This prevents the refrigerator from accurately monitoring and controlling its internal temperature. The issue may be with the sensor itself, its wiring, or the connector at the main PCB.
How do I fix the E r2 error on my LG refrigerator?
Start by checking the connector at CON7 pins 17 and 18 on the main PCB, as a loose or corroded connection is the most common cause. If reseating the connector does not clear the error, use a multimeter to test the resistance of the thermistor and inspect the wiring harness for damage. If the sensor resistance is out of range, the thermistor will need to be replaced. In rare cases, the main PCB itself may need to be replaced if the sensor and wiring both test correctly.
Is it safe to use my LG refrigerator while the E r2 code is displayed?
A faulty temperature sensor means the refrigerator may not maintain accurate or consistent temperatures inside the fresh food compartment. Using the appliance in this condition puts perishable food at risk of spoilage or unsafe temperatures. It is best to address the error promptly, and in the meantime check the actual internal temperature with a separate thermometer to assess whether food is being kept at a safe level below 40 degrees Fahrenheit.
Will resetting my LG refrigerator clear the E r2 error?
A power reset, such as unplugging the unit for a few minutes, may temporarily clear the code if the cause was a transient electrical issue or a momentarily loose connection. However, if the underlying problem with the sensor, wiring, or connector persists, the code will return once the control board completes its diagnostic cycle. A reset is a useful first step but is not a repair on its own.
How much does it cost to repair an E r2 error on an LG refrigerator?
If the fix is simply reseating a loose connector, there is no parts cost and the repair can be done without a technician. Replacing a faulty thermistor sensor is generally an inexpensive repair, with parts typically ranging from $15 to $50 depending on the specific model. If the main PCB requires replacement, costs rise considerably, often falling in the range of $150 to $400 or more for parts and labor combined.

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