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Error code reference

Frigidaire Refrigerator Error Code E9

Temperature sensor error

Frigidaire codesFrigidaire refrigerator codes

Temperature sensor error - a temperature sensor is indicating a problem.

First step from the service manual

Press the Alert Reset button to silence the alarm. Contact authorized service at 1-800-374-4432.

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

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What E9 means on a Frigidaire refrigerator

The E9 error code on a Frigidaire refrigerator indicates a temperature sensor fault. The refrigerator's control board continuously monitors readings from one or more thermistors positioned in the fresh food compartment, freezer compartment, or evaporator area. When a sensor transmits a reading outside of the expected resistance or voltage range, or loses continuity entirely, the control board registers the E9 code and triggers an audible alarm to alert the user.

Temperature sensors in refrigerators are typically negative temperature coefficient (NTC) thermistors, meaning their electrical resistance decreases as temperature rises. A properly functioning sensor will produce a predictable resistance value at a given temperature. When the control board receives a signal that falls outside its programmed parameters, such as an open circuit, a short circuit, or a wildly inconsistent reading, it interprets this as a sensor failure and displays E9.

Common causes include a failed thermistor, a damaged or corroded wiring harness leading to the sensor, or a loose connector at the sensor or control board. In some cases, ice buildup around a sensor can cause erratic readings without the sensor itself being defective. Because this fault can affect the refrigerator's ability to regulate cooling properly, it is important to have it diagnosed and repaired promptly. Pressing the Alert Reset button will silence the alarm but will not resolve the underlying fault.

Source: manufacturer service documentation.

Common causes of E9

  1. 01

    Failed temperature thermistor

    Part replacement

    The thermistor itself may have burned out or drifted out of its correct resistance range. A technician can test it with a multimeter to confirm whether it needs replacement.

  2. 02

    Damaged or broken wiring harness

    Part replacement

    The wires connecting the thermistor to the control board can become pinched, abraded, or corroded over time, causing an open or short circuit. Inspecting the wiring harness for visible damage is an important early diagnostic step.

  3. 03

    Loose or corroded connector

    Wiring / connection

    The plug connecting the sensor to the wiring harness can loosen or corrode, interrupting the signal to the control board. Reseating or cleaning the connector sometimes resolves the fault.

  4. 04

    Ice buildup around the sensor

    Wiring / connection

    Excessive frost or ice accumulation around the evaporator or sensor location can cause erratic temperature readings. Manually defrosting the refrigerator and checking whether the error clears can help determine if this is the root cause.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and wiring both test correctly, the main control board may be misreading or failing to process the sensor signal. Control board replacement is typically a last resort after other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about E9

What does E9 mean on a Frigidaire refrigerator?
The E9 code means the refrigerator has detected a problem with one of its temperature sensors. The control board is receiving a signal from a thermistor that falls outside the expected range, which could indicate a failed sensor, damaged wiring, or a loose connection. The alarm can be silenced by pressing the Alert Reset button, but the underlying issue still needs to be diagnosed and repaired.
Can I fix the E9 error on my Frigidaire refrigerator myself?
Some basic steps, like reseating a loose connector or manually defrosting the unit to clear ice buildup around a sensor, can be attempted by a knowledgeable DIYer. However, testing thermistor resistance and replacing control components generally requires electrical diagnostic tools and familiarity with refrigerator wiring. Frigidaire recommends contacting authorized service at 1-800-374-4432 for this fault.
Is it safe to keep using my refrigerator when it shows the E9 error?
A temperature sensor fault means the refrigerator may not be accurately monitoring its internal temperature, which could lead to food not being kept at a safe temperature. It is advisable to check the actual temperature inside the compartments using a standalone thermometer and limit how long you leave perishable food in the unit until the fault is resolved.
How much does it cost to repair an E9 error on a Frigidaire refrigerator?
Repair costs depend on the root cause. A thermistor replacement is generally a lower-cost repair, with parts typically ranging from around $15 to $50 and labor adding to that total. If the control board is at fault, parts alone can range from $100 to $300 or more. A service diagnostic call is usually needed first to pinpoint the exact failed component.
Will resetting the E9 error clear the problem permanently?
Pressing the Alert Reset button will silence the audible alarm, but it does not fix the underlying sensor fault. If the thermistor or wiring issue is still present, the E9 code will return. A permanent resolution requires diagnosing and repairing or replacing the faulty component.

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