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Error code reference

Jenn-Air Refrigerator Error Code F3E2

FC (Freezer Compartment) Thermistor is not working correctly

Jenn-Air codesJenn-Air refrigerator codes

FC (Freezer Compartment) Thermistor is not working correctly — open or shorted.

First step from the service manual

Run Test 02 FC Thermistor; if Open or Shorted, do an ohm reading at HV Board P20-15 to P20-16.

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

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What F3E2 means on a Jenn-Air refrigerator

The F3E2 error code on a Jenn-Air refrigerator indicates a fault with the FC (Freezer Compartment) thermistor. This thermistor is a temperature-sensing resistor responsible for relaying accurate freezer compartment temperature readings to the control board. When the control detects that the thermistor signal is either open (no continuity, meaning a broken circuit) or shorted (a direct circuit with near-zero resistance), it triggers the F3E2 fault because it can no longer trust the temperature data coming from that sensor.

The diagnostic process begins with running Test 02, which is the FC Thermistor test in the refrigerator's diagnostic mode. If the test confirms an open or shorted condition, the next step is to perform a resistance (ohm) reading directly at the High Voltage (HV) Board connector P20, specifically between pins 15 and 16. This test isolates whether the fault lies in the thermistor itself, in the wiring harness connecting it to the board, or in the HV board's input circuit. A thermistor that reads open will show no continuity, while a shorted thermistor will read near zero ohms, both of which fall outside the normal resistance range expected for a functional sensor.

Common causes include a failed thermistor, damaged wiring in the harness running between the freezer compartment sensor and the HV board, or a corroded or loose connector at the P20 terminals. Physical damage from ice buildup around the sensor, repeated freeze-thaw cycles, or a moisture intrusion event can all degrade the sensor or its wiring over time. Until this fault is resolved, the refrigerator's ability to properly regulate freezer temperatures may be compromised.

Source: manufacturer service documentation.

Common causes of F3E2

  1. 01

    Failed FC Thermistor

    Part replacement

    The thermistor itself has failed internally, resulting in an open or shorted reading. This is the most common cause and is confirmed when the ohm reading at HV Board P20 pins 15 to 16 falls outside the expected resistance range.

  2. 02

    Damaged Wiring Harness

    Part replacement

    The wiring between the freezer compartment thermistor and the HV board may be broken, pinched, or chafed, causing an open circuit. Visually inspect the harness for any cuts, kinks, or areas where the insulation has worn through.

  3. 03

    Loose or Corroded Connector at P20

    Wiring / connection

    The connector at HV Board P20 pins 15 and 16 may have worked loose or developed corrosion, interrupting the signal. Check the connector for secure seating and clean the terminals if oxidation is present.

  4. 04

    Moisture or Ice Damage to Sensor

    Part replacement

    Ice buildup or moisture intrusion around the thermistor can physically damage the sensor or its leads over time. Inspect the sensor mounting location for excessive frost accumulation or signs of water exposure.

  5. 05

    Faulty HV Board Input Circuit

    Part replacement

    If the thermistor and wiring both test correctly, the HV board itself may have a damaged input circuit at the P20 connector. This is the least common cause and is typically diagnosed after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about F3E2

What does F3E2 mean on a Jenn-Air refrigerator?
F3E2 indicates that the Freezer Compartment (FC) thermistor is not functioning correctly. The control board has detected that the sensor circuit is either open (broken) or shorted, meaning it cannot get a valid temperature reading from the freezer. Diagnosis involves running Test 02 and then checking resistance at HV Board connector P20 between pins 15 and 16.
Can I fix the F3E2 error myself?
A knowledgeable DIYer can attempt to diagnose the issue by checking the wiring harness for damage and verifying that the connector at HV Board P20 is secure and corrosion-free. Replacing the thermistor is a relatively accessible repair if the sensor is confirmed faulty. However, if the HV board itself needs replacement, that is a more complex and costly repair that may warrant professional service.
Is it safe to keep using my refrigerator while F3E2 is showing?
The refrigerator may continue to run, but without a functioning freezer thermistor, the control system cannot accurately regulate freezer temperatures. This puts frozen food at risk of spoilage or inadequate freezing. It is best to address the fault promptly rather than continue relying on the appliance in this condition.
How much does it cost to repair the F3E2 error on a Jenn-Air refrigerator?
If only the thermistor needs replacement, repair costs are typically modest, often in the range of $50 to $150 including parts and labor. If the wiring harness needs repair or replacement, costs may be somewhat higher. An HV board replacement is the most expensive scenario and could range from $200 to $500 or more depending on parts pricing and labor rates in your area.
Will resetting the refrigerator clear the F3E2 error code?
Resetting the refrigerator may temporarily clear the F3E2 code from the display, but the fault will return if the underlying problem with the thermistor or its wiring has not been corrected. A reset does not fix a failed sensor, damaged wiring, or a faulty board. Proper diagnosis and repair of the root cause are required to permanently resolve the error.

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