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Error code reference

LG Refrigerator Error Code Er r2

Refrigerator sensor 2 error (secondary error) caused by short or disconnection of refrigerator sensor 2; ICE…

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Refrigerator sensor 2 error (secondary error) caused by short or disconnection of refrigerator sensor 2; ICE PLUS indicator will not light.

First step from the service manual

Check for a loose connection between Main PCB and sensor, then check sensor resistance 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 Er r2 means on a LG refrigerator

The Er r2 error code on an LG refrigerator indicates a fault with Refrigerator Sensor 2, which is the secondary temperature sensor in the refrigerator compartment. This sensor monitors internal temperatures and provides feedback to the Main PCB so it can regulate the cooling system properly. When the control board detects either a short circuit or an open circuit (disconnection) in this sensor's signal circuit, it logs Er r2 and the ICE PLUS function is disabled as a result.

The diagnostic process begins at the wiring connection between the Main PCB and the sensor itself. A loose or corroded connector is the first thing to inspect, as vibration and thermal cycling over time can cause connector pins to back out of their housings. After ruling out a connection problem, the sensor's resistance should be measured directly at CON7 pins 17 and 18 on the Main PCB. A healthy NTC-type refrigerator sensor will show a resistance value that varies predictably with temperature. A reading of zero ohms indicates a short, while an open-circuit reading (infinite resistance or OL) points to a broken sensor or a severed wire.

If the connector and wiring harness check out but the resistance at CON7 pins 17-18 is out of specification, the sensor itself has failed and will need to be replaced. In some cases, the fault lies not in the sensor but in the Main PCB, where the input circuit for that sensor channel may be damaged. PCB-level failure is less common but should be considered after the sensor and wiring have been thoroughly inspected and tested.

Source: manufacturer service documentation.

Common causes of Er r2

  1. 01

    Loose or disconnected wiring connector

    Wiring / connection

    The connector linking Refrigerator Sensor 2 to the Main PCB can work itself loose over time due to vibration or thermal movement. Inspect the connector at CON7 on the Main PCB and reseat it firmly.

  2. 02

    Failed refrigerator sensor 2

    Part replacement

    The sensor itself can fail internally, resulting in either a short or an open circuit. Measuring resistance at CON7 pins 17-18 will reveal a zero-ohm or infinite-resistance reading if the sensor has failed.

  3. 03

    Damaged wiring harness

    Part replacement

    The wire leads running from the sensor to the Main PCB can become pinched, chafed, or broken, causing an intermittent or permanent open circuit. Visually trace the harness for any signs of damage or bare wires.

  4. 04

    Corroded connector pins

    Wiring / connection

    Moisture inside the refrigerator compartment can cause the pins at the sensor connector to corrode, increasing resistance or breaking the circuit entirely. Inspect pins for green or white oxidation and clean or replace the connector as needed.

  5. 05

    Faulty Main PCB sensor input circuit

    Part replacement

    If the sensor and all wiring test correctly but the error persists, the input channel for Sensor 2 on the Main PCB may be damaged. This is the least common cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about Er r2

What does Er r2 mean on a LG refrigerator?
Er r2 indicates that the Main PCB has detected a fault with Refrigerator Sensor 2, the secondary temperature sensor in the fridge compartment. The fault is caused by either a short circuit or a disconnection in the sensor circuit. As a result, the ICE PLUS indicator will not light and temperature regulation may be affected.
Can I fix the Er r2 error myself?
Some cases of Er r2 can be resolved without professional help, particularly if the cause is simply a loose connector. Start by unplugging the refrigerator, locating the connector at CON7 on the Main PCB, and firmly reseating it. If the error returns, testing sensor resistance at CON7 pins 17-18 requires a multimeter and some technical comfort, but is a manageable task for experienced DIYers.
Is it safe to keep using my refrigerator while Er r2 is displayed?
The refrigerator may continue to run with Er r2 active, but temperature control in the fresh food compartment could be less accurate than normal. This creates a risk of food spoilage if the sensor failure is causing the system to under-cool or over-cool. It is best to address the error promptly and monitor food temperatures in the meantime.
Will resetting my LG refrigerator clear the Er r2 error?
A reset by unplugging the unit for a few minutes may temporarily clear the error code, but if the underlying sensor fault or wiring problem still exists, the code will return. A reset alone is not a fix. The sensor circuit needs to be inspected and repaired before the error will stay cleared.
How much does it cost to repair an Er r2 error on an LG refrigerator?
If only the sensor needs replacement, parts and labor typically range from around $100 to $250 depending on your location and service provider. If the Main PCB is at fault, repair costs can range from $200 to $450 or more, since control boards are among the more expensive refrigerator components. Getting a diagnostic visit before committing to a repair helps determine which part is actually at fault.

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