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Kenmore Refrigerator Error Code ER FS

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

Freezer temperature sensor fault

The most common cause of the ER FS error on a Kenmore refrigerator is failed freezer thermistor (~55% of cases); start with: reseat the sensor connector.

💰 DIY cost: $0–$30 👨‍🔧 Pro cost: $140–$260 Save $140+ by doing it yourself
Kenmore Refrigerator error code ER FS on the display panel
How the ER FS code appears on a Kenmore refrigerator display

What Does Error Code ER FS Mean on a Kenmore Refrigerator?

Freezer temperature sensor fault.

ER FS fires when the main control board reads the freezer thermistor as electrically open or shorted rather than within its normal resistance range. Because the board loses a valid freezer temperature signal, it can no longer modulate the compressor and dampers accurately and falls back to a fixed duty cycle, letting freezer temperatures drift. It differs from ER RS, which flags the refrigerator (fresh-food) sensor, and from dH, a defrost-related fault — ER FS points specifically at the freezer sensor circuit or its wiring.

Models affected: LG-built Kenmore refrigerators on the 795 Series platform, plus similar side-by-side and French-door models sharing LG control electronics
What owners report: Owners commonly report ER FS appearing alongside a freezer that runs too warm or too cold, and it sometimes flashes intermittently before staying on. A loose or corroded connector can falsely trigger it, so many find that simply reseating the thermistor plug clears the code without a replacement part.

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
    Failed freezer thermistor 55% of cases
  2. 2
    Corroded/loose sensor connector 30% of cases
  3. 3
    Damaged harness wiring 15% of cases

How to Fix Kenmore Refrigerator Error Code ER FS

🔧 Easy DIY Est. time: 10–20 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Reseat the sensor connector

    Unplug and reseat the thermistor plug behind the freezer panel.

    ⚠️ Unplug the refrigerator first.
  2. 2

    Test the thermistor

    Measure resistance — it should change smoothly with temperature; open or 0 ohms means failed.

  3. 3

    Replace the sensor

    Swap the thermistor if out of spec.

    🔩 Kenmore freezer thermistor ($12–$30)

How to Reset Error Code ER FS

Power cycle for 5 minutes after replacement; ER FS clears when the sensor reads in range.

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

Symptom guide: Refrigerator not cooling →

Did this guide fix your appliance?

When to Call a Professional

If a new sensor still errors, the main board input has failed — call a pro.

Average professional repair cost for this issue: $140–$260

Related Error Codes

ER RS
Refrigerator temperature sensor fault
⚠ Medium Severity
dH
Defrost heater fault — defrost did not complete
⚠ High Severity

Same Code on Other Brands

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

LG logo
LG Refrigerator Er FS
Freezer temperature sensor error

Find Replacement Parts

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

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

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

More Kenmore Refrigerator Error Codes

ER FF Freezer evaporator fan motor fault ER IF Icemaker fan motor fault ER 1F Ice room fan feedback error ER RF Refrigerator compartment fan motor fault CF Condenser fan motor fault

Frequently Asked Questions

Can I keep using my Kenmore Refrigerator when error ER FS appears? +
You often can for a cycle or two, but the temperature-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 Kenmore Refrigerator? +
Across reported Kenmore refrigerator repairs, the most frequent is failed freezer thermistor (55% of cases), corroded/loose sensor connector (30%), then damaged harness wiring (15%). 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 temperature-sensor problem is still present. Move on to the physical checks — reseat the sensor connector, then test the thermistor — since the code will reappear until the root cause is resolved. This is a beginner-friendly job needing only basic hand tools.
How much does it cost to fix Kenmore Refrigerator error ER FS? +
A DIY repair typically runs $0–$30 in parts, versus $140–$260 for a professional service call, so handling it yourself saves around $140. Expect the work to take about 10–20 minutes.
Which Kenmore Refrigerator models show error ER FS? +
ER FS is documented on LG-built Kenmore refrigerators on the 795 Series platform, plus similar side-by-side and French-door models sharing LG control electronics. 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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