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Error code reference

Jenn-Air Oven Error Code F1E7-2

Microwave ACU over temperature

Jenn-Air codesJenn-Air oven codes

Microwave ACU over temperature — Temp sensor shorted.

First step from the service manual

Unplug range or disconnect power. Inspect connections to main control for loose/unplugged connectors.

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

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What F1E7-2 means on a Jenn-Air oven

The F1E7-2 error code on a Jenn-Air oven indicates an over-temperature condition in the microwave Appliance Control Unit (ACU), specifically caused by a shorted temperature sensor. The ACU monitors internal component temperatures to prevent thermal damage. When the temperature sensor circuit reads a shorted condition, the resistance in the sensor circuit drops abnormally low, causing the control board to interpret this as an extreme over-temperature event. This triggers the F1E7-2 fault and disables microwave operation as a protective measure.

The temperature sensor involved is typically a thermistor that provides resistance-based temperature feedback to the ACU. A shorted thermistor means the sensor is no longer providing accurate resistance values, instead allowing current to pass through with little or no resistance. This can result from physical damage to the sensor, degraded insulation on the sensor wiring harness, or a connector that has developed an internal short due to moisture, heat exposure, or mechanical wear.

Diagnosis begins with a complete power disconnect before inspecting the wiring harness connections at the main control board. Loose, corroded, or improperly seated connectors can mimic a sensor short and should be ruled out first. If connections are secure and properly seated, the thermistor itself and its associated wiring should be tested for a short-to-ground or wire-to-wire short condition. A confirmed shorted sensor will require component replacement to clear the fault permanently.

Source: manufacturer service documentation.

Common causes of F1E7-2

  1. 01

    Loose or disconnected wiring connector at ACU

    Wiring / connection

    A connector that is partially unseated or has backed out at the main control board can create a false short reading. Inspecting and firmly reseating all connectors to the ACU is the first step and costs nothing.

  2. 02

    Shorted temperature sensor (thermistor)

    Part replacement

    The thermistor itself may have failed internally, causing its resistance to drop to near zero and triggering the short detection. This is confirmed by measuring resistance across the sensor terminals, where a reading near zero ohms indicates a failed sensor.

  3. 03

    Damaged or pinched sensor wiring harness

    Part replacement

    The wiring between the thermistor and the ACU may have developed a short due to insulation wear, heat damage, or a pinched section of wire. Visually trace the harness for burned areas, chafing, or contact with hot surfaces.

  4. 04

    Moisture or corrosion in sensor connector

    Wiring / connection

    Moisture intrusion into the sensor connector can bridge terminals and create a low-resistance path that registers as a short. Inspect the connector terminals for corrosion, discoloration, or visible moisture deposits.

  5. 05

    Failed ACU (main control board)

    Part replacement

    If the sensor and all wiring test within acceptable parameters, the ACU itself may have an internal fault causing it to misread the sensor circuit. A failed control board is the least common cause and is typically diagnosed only after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about F1E7-2

What does F1E7-2 mean on a Jenn-Air oven?
F1E7-2 indicates that the microwave Appliance Control Unit has detected an over-temperature condition caused by a shorted temperature sensor. The sensor circuit is reading abnormally low resistance, which the control board interprets as a fault. The microwave function will be disabled until the issue is diagnosed and corrected.
Can I fix F1E7-2 on my Jenn-Air oven myself?
Some homeowners with electrical knowledge can handle the initial steps, such as unplugging the unit and inspecting wiring connectors for loose or unseated connections. If the fault involves a shorted thermistor or damaged wiring harness, those repairs require component testing and part replacement, which are better suited to a trained technician. Working inside the oven cavity and near the control board requires full power disconnection before any inspection.
Is it safe to use my Jenn-Air oven when F1E7-2 is displayed?
The oven's microwave function should be considered out of service when this code is active, as the control system has detected a sensor fault and disabled that function as a protective measure. Standard bake and broil functions may still operate depending on the model, but continuing to use the appliance without addressing the fault is not recommended. Disconnect power and have the unit inspected before resuming normal use.
Will resetting my Jenn-Air oven clear the F1E7-2 error?
Unplugging the range or cycling the breaker may temporarily clear the fault display, but the code will return if the underlying sensor short is still present. A reset does not repair a shorted thermistor or damaged wiring. The root cause must be identified and corrected for the fault to stay cleared.
How much does it cost to repair a Jenn-Air oven showing F1E7-2?
Repair costs vary depending on the root cause. If the issue is only a loose connector, there may be no parts cost beyond a service call fee, which typically ranges from $75 to $150. Replacing a shorted thermistor sensor generally adds $20 to $80 in parts. If the ACU main control board has failed, parts alone can range from $150 to $400 or more, plus labor.

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