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Error code reference

LG Refrigerator Error Code Er F2

Refrigerator sensor 2 error

LG codesLG refrigerator codes

Refrigerator sensor 2 error - sensor is shorted, open, or reading out of range.

First step from the service manual

Check for a loose connection at CON6 Pin7 to Pin8, then measure sensor resistance.

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

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What Er F2 means on a LG refrigerator

The Er F2 code on an LG refrigerator indicates a fault with refrigerator sensor 2, one of the thermistor sensors responsible for monitoring compartment or evaporator temperatures in the fresh food section. The control board monitors the resistance output of this sensor continuously. When the resistance value falls outside the expected range, either because the sensor has shorted to a very low resistance, gone open-circuit to an effectively infinite resistance, or is simply reading a value outside the accepted operating window, the board logs this fault and displays Er F2.

The diagnostic process begins at connector CON6, specifically pins 7 and 8, which carry the signal from sensor 2 to the main control board. A loose, corroded, or damaged connection at this point is the most common cause of the error and should be inspected first. If the connector checks out, the next step is measuring the thermistor resistance directly. NTC thermistors used in LG refrigerators change resistance predictably with temperature, so a reading that is near zero ohms indicates a short, while a reading of infinite or several megaohms indicates an open circuit.

If the wiring harness and connector are intact but resistance is out of spec, the sensor itself has failed and requires replacement. In less common cases, the fault can trace back to the main control board if it is misreading or not supplying the correct reference voltage to the sensor circuit. Always confirm the sensor and wiring are at fault before replacing the board.

Source: manufacturer service documentation.

Common causes of Er F2

  1. 01

    Loose or corroded connector at CON6 Pin7-Pin8

    Wiring / connection

    A loose, dirty, or corroded connection at CON6 pins 7 and 8 interrupts the signal between the sensor and the control board. Inspect the connector for bent pins, moisture damage, or a latch that has not fully seated.

  2. 02

    Failed refrigerator thermistor sensor 2

    Part replacement

    The thermistor itself can fail by shorting internally or going open-circuit. Measure resistance across the sensor leads; a reading near zero ohms or an open circuit reading confirms the sensor has failed and needs replacement.

  3. 03

    Damaged wiring harness

    Part replacement

    The wire run between sensor 2 and CON6 can be pinched, chafed, or broken, particularly near routing clips or door hinges. Visually trace the harness and use a multimeter to check for continuity breaks or shorts to ground.

  4. 04

    Moisture or ice buildup around the sensor

    Wiring / connection

    Ice accumulation around the sensor or its connector can cause erratic resistance readings or a temporary short. Defrosting the refrigerator manually and drying the area thoroughly may resolve intermittent Er F2 faults.

  5. 05

    Faulty main control board

    Part replacement

    If the sensor and all wiring test within spec, the main control board may be failing to supply the correct reference voltage or misinterpreting the sensor signal. This is the least likely 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 F2

What does Er F2 mean on a LG refrigerator?
Er F2 indicates a fault with refrigerator sensor 2, a thermistor that monitors temperature inside the fresh food compartment. The control board has detected that the sensor's resistance is shorted, open, or outside the expected operating range. The error typically points to a loose connector at CON6 pins 7 and 8, a failed thermistor, or a damaged wiring harness. Diagnosing the connector and measuring sensor resistance are the first steps to identifying the root cause.
Can I fix Er F2 myself, or do I need a technician?
Checking and reseating the connector at CON6 pins 7 and 8 is a straightforward task that most handy homeowners can perform after unplugging the refrigerator. Measuring thermistor resistance with a multimeter is also a manageable DIY step. If the sensor itself needs replacement, the repair remains relatively accessible. However, if the fault traces back to the main control board, professional diagnosis is recommended to avoid unnecessary parts costs.
Is it safe to keep using my refrigerator while Er F2 is displayed?
A failed temperature sensor means the control board may not accurately regulate cooling in the fresh food section. This can result in the compartment running too warm, which creates a food safety risk, or running too cold, which can freeze fresh food. It is best to address the error promptly and use a standalone thermometer to monitor temperatures if you need to continue using the unit briefly before the repair.
How much does it cost to repair an Er F2 error on an LG refrigerator?
If the fix is simply reseating a loose connector, there is no parts cost involved. A replacement thermistor sensor typically costs between $15 and $50 depending on the specific part. If a wiring harness section needs replacement, parts can range from $20 to $80. A main control board replacement is the most expensive scenario, with parts generally ranging from $100 to $300, plus labor if a technician is performing the repair.
Will resetting my LG refrigerator clear the Er F2 code?
Unplugging the refrigerator for a few minutes and restoring power may temporarily clear the error code, but it will return if the underlying fault is still present. A reset is useful to confirm whether the error is intermittent or persistent, and to check if a loose connector was the only issue after reseating it. A permanent resolution requires identifying and correcting the root cause, whether that is a bad connection, a failed sensor, or damaged wiring.

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