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LG Refrigerator Error Code FS

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 11, 2026
⚠ Medium Severity 🔧🔧 Moderate DIY

Freezer sensor fault — freezer thermistor circuit open or shorted

The most common cause of the FS error on a LG refrigerator is freezer thermistor failed (~50% of cases); start with: power cycle.

💰 DIY cost: $0–$25 👨‍🔧 Pro cost: $130–$260 Save $130+ by doing it yourself
LG Refrigerator error code FS on the display panel
How the FS code appears on a LG refrigerator display

What Does Error Code FS Mean on a LG Refrigerator?

Freezer sensor fault — freezer thermistor circuit open or shorted.

FS fires when the control board reads the freezer thermistor circuit as electrically open or shorted, meaning resistance falls outside the valid range for a functioning sensor. Without a trustworthy freezer temperature reading, the board loses proper defrost timing and compressor control, so freezer temperatures drift. It is the abbreviated variant of the full freezer-sensor error and is distinguished from refrigerator-compartment sensor codes and from the Er SS/1F faults by pointing specifically at the freezer thermistor and its wiring.

Models affected: LG refrigerators with two-character display panels that report the short-form freezer sensor code, spanning both side-by-side and French-door layouts
What owners report: Owners commonly report FS appearing after a defrost cycle or when moisture works into the sensor connector, and a simple reseat or cleaning of a corroded plug sometimes clears it. It can also be a false alarm from a loose connection, so a power cycle is worth trying before replacing parts.

What Causes Error Code FS?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Freezer thermistor failed 50% of cases
  2. 2
    Connector corrosion in the cold/moist environment 30% of cases
  3. 3
    Harness pinched or broken behind panels 12% of cases
  4. 4
    Board sensing fault 8% of cases

How to Fix LG Refrigerator Error Code FS

🔧🔧 Moderate DIY Est. time: 30–60 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Power cycle

    Unplug for 2 minutes and watch the display after restart.

  2. 2

    Inspect and reseat the connector

    Unplug the unit, remove the freezer back panel, and check the sensor plug for green corrosion; clean and reseat.

    ⚠️ Unplug the refrigerator before removing interior panels.
  3. 3

    Replace the thermistor

    Test resistance and replace if open or shorted; heat-shrink the splice to keep moisture out.

    🔩 LG refrigerator thermistor ($10–$25)

How to Reset Error Code FS

Unplug for 2 minutes; FS clears automatically once the sensor circuit reads normally.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full LG refrigerator reset guide → Enter diagnostic mode →

Did this guide fix your appliance?

When to Call a Professional

Repeat FS errors after sensor replacement point to a harness break inside the cabinet — professional tracing recommended.

Average professional repair cost for this issue: $130–$260

Related Error Codes

Er SS
Freezer sensor error — freezer compartment thermistor out of range
⚠ Medium Severity
1F
Freezer (ice room) fan fault — icing fan circuit failure
⚠ Medium Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your LG Refrigerator:

🔩
Search PartSelect
LG Refrigerator repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More LG Refrigerator Error Codes

Er FF Freezer fan error — fan motor not operating Er dH Defrost heater error — defrost cycle not completing Er CF Condenser fan motor error Er FS Freezer temperature sensor error Er IS Ice maker sensor failure Er IF Ice maker fan error

Frequently Asked Questions

Can I keep using my LG Refrigerator when error FS appears? +
You often can for a cycle or two, but the sensor issue behind FS will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.
What most commonly causes FS on a LG Refrigerator? +
Across reported LG refrigerator repairs, the most frequent is freezer thermistor failed (50% of cases), connector corrosion in the cold/moist environment (30%), then harness pinched or broken behind panels (12%). Check them in that order before replacing any parts.
FS keeps coming back after a reset — what should I check next? +
A reset only clears the stored FS fault; if it returns, the sensor problem is still present. Move on to the physical checks — power cycle, then inspect and reseat the connector — since the code will reappear until the root cause is resolved. This is a moderate job — a multimeter and some disassembly are usually involved.
How much does it cost to fix LG Refrigerator error FS? +
A DIY repair typically runs $0–$25 in parts, versus $130–$260 for a professional service call, so handling it yourself saves around $130. Expect the work to take roughly 30–60 minutes.
Which LG Refrigerator models show error FS? +
FS is documented on LG refrigerators with two-character display panels that report the short-form freezer sensor code, spanning both side-by-side and French-door layouts. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 11, 2026.

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