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Error code reference

Jenn-Air Oven Error Code F4E2-2

Microwave magnetron temperature sensor open.

Jenn-Air codesJenn-Air oven codes

Microwave magnetron temperature sensor open.

First step from the service manual

Unplug range or disconnect power. Inspect connections to main control and microwave magnetron.

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

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What F4E2-2 means on a Jenn-Air oven

The F4E2-2 error code on a Jenn-Air oven indicates that the main control board has detected an open circuit condition in the microwave magnetron temperature sensor. This sensor is a thermistor or thermal cutout device mounted on or near the magnetron in the microwave section of the appliance. Its job is to monitor the operating temperature of the magnetron and report that data back to the control board. When the circuit reads as open, the control board cannot confirm a valid temperature signal, so it faults out to prevent potential overheating damage to the magnetron.

An open circuit in this sensor circuit can result from a few different failure points. The most common causes are a broken or disconnected wiring harness between the sensor and the main control board, a failed sensor itself, or a damaged connector pin that has lost continuity. Because the magnetron operates in a high-heat environment, wiring insulation can degrade over time, and connector terminals can loosen or corrode, both of which can interrupt the sensor signal.

Diagnosis should begin with a full power disconnect before inspecting any components. The wiring connections at both the main control board and the magnetron temperature sensor should be checked for secure seating, corrosion, and visible damage. If the connections are intact, resistance testing of the sensor itself will confirm whether the sensor has failed open. A functioning temperature sensor will show a measurable resistance value; an open sensor will read as infinite resistance on a multimeter.

Source: manufacturer service documentation.

Common causes of F4E2-2

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    A connector at either the main control board or the magnetron temperature sensor may have worked loose over time. Inspect both ends of the harness for secure seating and check for any broken or backed-out terminal pins.

  2. 02

    Failed magnetron temperature sensor

    Part replacement

    The sensor itself may have failed in an open state, meaning it no longer conducts electricity through its circuit. Testing the sensor with a multimeter will show infinite resistance if it has failed open.

  3. 03

    Damaged wiring between sensor and control board

    Part replacement

    Heat exposure near the magnetron can degrade wire insulation and cause breaks in the conductor. Visually inspect the harness routing for burn marks, chafing, or breaks in the wire.

  4. 04

    Corroded or burned connector terminals

    Wiring / connection

    Terminal pins inside the connectors can corrode or suffer heat damage, interrupting continuity even when the connector appears seated. Check the terminals for discoloration, pitting, or oxidation.

  5. 05

    Faulty main control board

    Part replacement

    If the sensor and all wiring check out correctly, the main control board itself may have a defect preventing it from reading the sensor circuit. This is the least likely cause and should only be considered after other components are ruled out.

See the test procedure for each cause

Frequently asked questions about F4E2-2

What does F4E2-2 mean on a Jenn-Air oven?
F4E2-2 indicates that the main control board is detecting an open circuit in the microwave magnetron temperature sensor. The sensor is responsible for monitoring heat levels at the magnetron, and an open circuit means no valid temperature signal is reaching the control board. This causes the appliance to fault to prevent potential overheating damage.
Can I fix F4E2-2 myself, or do I need a technician?
Some causes of this error are within reach of a knowledgeable DIYer. After disconnecting power, you can inspect the wiring harness and connectors at both the magnetron sensor and the main control board for visible damage or loose connections. If the issue is a failed sensor or damaged wiring, replacing those components requires moderate comfort with appliance repair and a multimeter for proper diagnosis. A failed main control board is a more complex repair and may warrant a professional.
Is it safe to use my Jenn-Air oven when F4E2-2 is displayed?
You should not use the microwave function of your Jenn-Air appliance while this error is active. The magnetron temperature sensor is a safety component, and operating the magnetron without a functioning temperature monitor could allow it to overheat without triggering a protective shutdown. Other oven functions may still operate, but confirm this with your specific model's behavior before using the appliance.
Will resetting the oven clear the F4E2-2 error code?
Unplugging the appliance or cutting power at the breaker for several minutes may temporarily clear the error, but it will return if the underlying fault is still present. A reset does not repair a failed sensor, broken wire, or loose connector. Clearing the code without addressing the root cause means the appliance will fault again the next time the microwave function is used.
How much does it cost to repair the F4E2-2 error on a Jenn-Air oven?
Repair costs vary depending on what component has failed. If only a connector needs to be reseated or a short wiring section repaired, costs may be minimal. A replacement magnetron temperature sensor typically falls in a lower parts price range, while a new main control board is considerably more expensive. Adding professional labor, total repair costs can range from around $100 to $400 or more depending on the failed component and your location.

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