What does Kenmore refrigerator error code Er FS mean?

Er FS means the freezer temperature sensor has failed. It is an inexpensive part — test it with a multimeter and replace if the reading is out of range.

Er FS

Kenmore Refrigerator Error Code Er FS — Freezer Sensor Malfunction

Moderate 20–30 minutes Tools: Multimeter, Screwdriver set

What this means

Error Er FS indicates the freezer thermistor has shorted out or its wiring has disconnected. This sensor tells the control board the current freezer temperature. When it fails, the compressor may run continuously or not at all, causing incorrect freezer temperatures.

Alternate codes: Er fS

Step-by-step fix

4 steps

Locate the thermistor

The freezer thermistor is usually clipped to the evaporator cover or the air duct inside the freezer.

Test the thermistor

Disconnect and test resistance. At 0°F it should read approximately 16,000 ohms (varies by model).

Check wiring

Inspect the wiring from the thermistor to the main control board.

Replace the thermistor

If it reads out of range, replace it. This is an inexpensive DIY repair.

When to call a professional

Thermistor replacement is a straightforward DIY task for most homeowners.

Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.

Learn more about our sources

Parts you may need

Freezer Thermistor

Part #242127801 · $10–$25

If sensor has failed

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Quick Info

BrandKenmore

ApplianceRefrigerator

Error CodeEr FS

DifficultyModerate

Est. Time20–30 minutes