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LG Refrigerator Error Code Er FS

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 10, 2026
⚠ Medium Severity 🔧🔧 Moderate DIY

Freezer temperature sensor error

The most common cause of the Er FS error on a LG refrigerator is thermistor open circuit (~65% of cases); start with: test thermistor.

💰 DIY cost: $15–$40 👨‍🔧 Pro cost: $150–$300 Save $135+ by doing it yourself
LG Refrigerator error code Er FS on the display panel
How the Er FS code appears on a LG refrigerator display

What Does Error Code Er FS Mean on a LG Refrigerator?

Freezer temperature sensor error.

Er FS fires when the control board reads a freezer thermistor resistance outside its valid window, typically from an open circuit but sometimes a shorted or drifted NTC sensor. Because the board loses a trusted freezer reading, it falls back to a timed compressor routine, letting the compartment drift warm or cold. This differs from Er FF, which points to a freezer fan/airflow fault, and from Er dH, which flags a defrost heater or defrost-sensor problem rather than the compartment temperature sensor itself.

Models affected: LG refrigerators using the Er FS diagnostic scheme, including models such as the LFXS26973S, LFXS28968S, LRFVS3006S, LMXS28626S, and LRFDS3016S, as well as similar French-door and side-by-side units with freezer thermistor monitoring
What owners report: Owners commonly report Er FS appearing after a defrost cycle or a jostled connector, sometimes alongside a freezer that feels too warm or forms frost unevenly. A loose or moisture-affected sensor plug can trigger it falsely, and many find that reseating the connector clears the code before a full thermistor swap is needed.

What Causes Error Code Er FS?

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

  1. 1
    Thermistor open circuit 65% of cases
  2. 2
    Connector loose 25% of cases
  3. 3
    Wiring harness fault 10% of cases

How to Fix LG Refrigerator Error Code Er FS

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

    Test thermistor

    At 32°F/0°C: ~16k ohms.

    🔩 Multimeter
  2. 2

    Reseat connector

    Firmly reconnect sensor wiring.

  3. 3

    Replace thermistor

    Clip-on replacement to evaporator.

    🔩 LG thermistor ($15–$40)

How to Reset Error Code Er FS

Allow 24 hours temperature stabilization after repair.

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

If new thermistor and error persists, control board sensor input failed.

Average professional repair cost for this issue: $150–$300

Related Error Codes

Er FF
Freezer fan error — fan motor not operating
⚠ High Severity
Er dH
Defrost heater error — defrost cycle not completing
⚠ Medium Severity

Same Code on Other Brands

Error code Er FS appears on these other brands too. See every brand that shows Er FS →

Kenmore logo
Kenmore Refrigerator ER FS
Freezer temperature sensor fault

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 CF Condenser fan motor error Er IS Ice maker sensor failure Er IF Ice maker fan error Er CO Communication error — main board to sub-board dS Defrost sensor open circuit Er rS Refrigerator (fresh-food) compartment sensor error

Frequently Asked Questions

Can I keep using my LG Refrigerator when error Er FS appears? +
You often can for a cycle or two, but the sensor issue behind Er FS will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.
What most commonly causes Er FS on a LG Refrigerator? +
Across reported LG refrigerator repairs, the most frequent is thermistor open circuit (65% of cases), connector loose (25%), then wiring harness fault (10%). Check them in that order before replacing any parts.
Er FS keeps coming back after a reset — what should I check next? +
A reset only clears the stored Er FS fault; if it returns, the sensor problem is still present. Move on to the physical checks — test thermistor, then reseat 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 Er FS? +
A DIY repair typically runs $15–$40 in parts, versus $150–$300 for a professional service call, so handling it yourself saves around $135. Expect the work to take roughly 30–60 minutes.
Which LG Refrigerator models show error Er FS? +
Er FS is documented on LG refrigerators using the Er FS diagnostic scheme, including models such as the LFXS26973S, LFXS28968S, LRFVS3006S, LMXS28626S, and LRFDS3016S, as well as similar French-door and side-by-side units with freezer thermistor monitoring. 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 10, 2026.

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