mypros+
Error code reference

LG Refrigerator Error Code E FS

Freezer sensor error

LG codesLG refrigerator codes

Freezer sensor error — the freezer temperature sensor has a short, open, or abnormal resistance reading.

First step from the service manual

Check for a loose connection between Main PCB (CON7 pins 17-18) and sensor, then check sensor resistance.

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

MyPros+ Max

Get the full diagnostic procedure for E FS.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E FS means on a LG refrigerator

The E FS error code on an LG refrigerator indicates a freezer temperature sensor fault. The freezer sensor (also called a thermistor) is a negative temperature coefficient (NTC) resistor that continuously reports freezer compartment temperature to the main PCB. When the control board detects a resistance reading that falls outside the expected range, either due to a short circuit, an open circuit, or an out-of-range resistance value, it triggers the E FS code and may limit or disable compressor and fan operation to protect the system.

The sensor connects to the main PCB at connector CON7, specifically pins 17 and 18. The first diagnostic step is to inspect this connector for looseness, corrosion, or bent pins, as a poor connection can mimic a failed sensor by producing erratic or absent resistance readings. If the connection is secure, the next step is to measure the sensor's resistance directly with a multimeter and compare the reading against the temperature-resistance chart for that sensor. A functioning NTC thermistor will show higher resistance at colder temperatures and lower resistance as temperature rises. A reading of zero ohms indicates a short, while an infinite resistance reading indicates an open circuit.

Common root causes include physical damage to the sensor wire harness from ice buildup or freezer drawer contact, moisture intrusion into the connector causing corrosion, a thermistor that has drifted out of specification due to age, or in less common cases, a faulty main PCB that misreads a correctly functioning sensor. Ruling out wiring and connector issues before replacing the sensor itself is essential, since a new sensor will not resolve the error if the underlying connection or board problem persists.

Source: manufacturer service documentation.

Common causes of E FS

  1. 01

    Loose or corroded connector at Main PCB

    Wiring / connection

    The sensor connects to the main PCB at CON7 pins 17 and 18. A loose, corroded, or improperly seated connector can cause the board to read an incorrect resistance value, triggering the fault without the sensor itself being defective.

  2. 02

    Damaged sensor wiring harness

    Part replacement

    Ice accumulation or contact with freezer drawers and shelving can pinch, cut, or abrade the sensor wire, causing an open or short circuit in the harness. Inspect the full wire run from the sensor to the connector for visible damage.

  3. 03

    Failed freezer thermistor

    Part replacement

    The NTC thermistor itself can fail over time, producing a resistance reading that is shorted, open, or outside the normal temperature-resistance curve. This is confirmed by measuring resistance directly at the sensor terminals with a multimeter.

  4. 04

    Moisture or ice intrusion at the connector

    Wiring / connection

    Water or frost reaching the CON7 connector can cause corrosion on the pins or temporary short circuits that produce intermittent E FS errors. Drying and cleaning the connector may resolve the fault if no other damage is found.

  5. 05

    Faulty main PCB

    Part replacement

    If the sensor and wiring both test within specification, the main PCB may be misinterpreting the sensor signal due to a failed input circuit on the board. This is the least common cause and should only be considered after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about E FS

What does E FS mean on a LG refrigerator?
E FS on an LG refrigerator indicates a freezer temperature sensor error. The main control board has detected that the freezer thermistor is producing a short, open, or out-of-range resistance reading. This prevents the refrigerator from accurately monitoring freezer temperature. The fault can stem from a loose connector, damaged wiring, or a failed sensor.
Can I fix the E FS error myself?
Some causes of E FS are DIY-accessible, such as reseating the sensor connector at CON7 pins 17 and 18 on the main PCB or inspecting the wire harness for visible damage. Testing sensor resistance with a multimeter is also a straightforward step for someone comfortable with basic electrical diagnostics. However, if the main PCB needs replacement, most homeowners prefer to have a technician handle that repair.
Is it safe to keep using my refrigerator while it shows E FS?
An active E FS error means the control board cannot reliably monitor freezer temperature, so the freezer may not maintain safe storage temperatures. Food safety could be at risk if the cooling system is affected. It is best to check freezer temperatures with a separate thermometer and address the fault promptly rather than continuing normal use indefinitely.
How much does it cost to repair an E FS error on an LG refrigerator?
Repair costs depend on the root cause. A freezer thermistor sensor typically costs between $15 and $50 for the part, while professional labor can add $80 to $150 depending on your location. If the main PCB is at fault, parts alone can range from $100 to $300 or more. Starting with connector and wiring checks can help avoid unnecessary parts costs.
Will resetting my LG refrigerator clear the E FS error?
Performing a reset by unplugging the refrigerator for a few minutes may temporarily clear the E FS code, but the error will return if the underlying cause is not corrected. A reset is useful for confirming whether the fault is intermittent or persistent, but it does not repair a damaged sensor, faulty wiring, or bad connector. A proper diagnosis and repair are needed for a lasting fix.

Related LG refrigerator codes

All LG refrigerator codes
View all 485 LG refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass