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Error code reference

Frigidaire Refrigerator Error Code E1

Refrigerator room sensor failure

Frigidaire codesFrigidaire refrigerator codes

Refrigerator room sensor failure — problem with the sensor terminals of the R room or the sensor circuit.

First step from the service manual

Check the status and connections of the R room sensor (CN1)

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What E1 means on a Frigidaire refrigerator

The E1 error code on a Frigidaire refrigerator indicates a failure in the refrigerator compartment room sensor, also referred to as the R room sensor. This thermistor-based sensor monitors the internal temperature of the fresh food compartment and sends resistance-based signals to the main control board. When the control board detects an out-of-range signal or an open/short circuit in the sensor or its wiring, it triggers the E1 code and may suspend normal cooling operations to prevent further issues.

The sensor circuit involves the R room sensor itself, the wiring harness connecting it to the control board, and the connector terminal labeled CN1. Problems can develop at any point along this circuit. The most common failure points are the connector terminals at CN1, where corrosion, moisture intrusion, or physical loosening can interrupt signal continuity. The sensor element itself can also fail due to age or heat stress, causing it to read outside the expected resistance range for the ambient temperature.

Diagnosing E1 starts at the CN1 connector. Inspect the terminals for corrosion, bent pins, or loose seating. If the connector checks out, the sensor's resistance should be measured with a multimeter and compared against the expected resistance-to-temperature curve for the component. A reading that is open (infinite resistance) or shorted (near-zero resistance) confirms sensor failure. Wiring continuity between CN1 and the sensor should also be verified before replacing any parts.

Source: manufacturer service documentation.

Common causes of E1

  1. 01

    Loose or corroded CN1 connector terminals

    Wiring / connection

    The CN1 connector linking the R room sensor to the control board can develop loose pins or corrosion over time, breaking the signal circuit. Inspect the connector for oxidation, bent terminals, or incomplete seating.

  2. 02

    Failed refrigerator compartment thermistor

    Part replacement

    The R room sensor thermistor can fail internally, producing an open or shorted circuit that the control board reads as an E1 fault. Confirm failure by measuring the sensor's resistance with a multimeter and checking for an open or near-zero reading.

  3. 03

    Damaged wiring harness

    Part replacement

    The wiring between the R room sensor and CN1 can be pinched, chafed, or broken, interrupting signal continuity. A continuity test along each wire in the harness will identify any open segments.

  4. 04

    Moisture or ice buildup at the sensor

    Wiring / connection

    Excessive frost or moisture around the sensor mounting location can interfere with sensor readings or accelerate terminal corrosion. Check the sensor location for ice accumulation or signs of water damage.

  5. 05

    Control board fault

    Part replacement

    If the sensor, wiring, and connector all test correctly, the main control board may be misreading the sensor circuit signal. This is the least common cause and should only be considered after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about E1

What does E1 mean on a Frigidaire refrigerator?
E1 indicates a failure in the refrigerator compartment room sensor or its circuit. The control board is unable to receive a valid signal from the R room temperature sensor, which monitors the fresh food section. The issue can originate at the sensor itself, the wiring, or the CN1 connector terminals. The refrigerator may not cool properly until the fault is resolved.
Can I fix an E1 error on my Frigidaire refrigerator myself?
A knowledgeable DIYer can often resolve an E1 error by inspecting and reseating the CN1 connector, checking for visible wiring damage, and testing the sensor with a multimeter. If the sensor reads open or shorted, replacing the thermistor is a straightforward repair. Control board replacement is more complex and may warrant professional service.
Is it safe to keep using my refrigerator while E1 is displayed?
Operating the refrigerator with an active E1 code carries some risk, as the control board may not be able to regulate compartment temperature accurately. Food safety could be compromised if the fresh food compartment is not maintaining proper temperatures. It is best to check actual internal temperatures with a separate thermometer and address the fault promptly.
How much does it cost to repair an E1 error on a Frigidaire refrigerator?
If only the CN1 connector needs cleaning or reseating, there may be no parts cost at all. A replacement R room thermistor sensor typically costs between $15 and $50 for the part. If a control board replacement is needed, parts and labor combined can range from $150 to $400 or more depending on the model and service provider.
Will resetting my Frigidaire refrigerator clear the E1 error code?
A power reset may temporarily clear the E1 code, but it will return if the underlying sensor or wiring fault is still present. Unplugging the unit for a few minutes and restoring power can confirm whether the fault is intermittent or persistent. A recurring E1 after reset means the root cause in the sensor circuit must be diagnosed and repaired.

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