Jenn-Air Oven Error Code F4E2-2

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.

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.

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.

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.

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.