Jenn-Air Oven Error Code F4E1

The F4E1 error code on a Jenn-Air oven indicates a fault in the microwave cavity temperature sensor circuit. This sensor monitors the internal temperature of the microwave cavity to ensure safe and accurate operation. When the control board detects a signal from this sensor that falls outside the expected range, whether open, shorted, or intermittent, it triggers the F4E1 fault and interrupts operation to prevent damage or unsafe conditions.

The most common source of this error is a wiring issue rather than a failed sensor itself. The sensor probe cable and its connector, designated J62 on the control board, are the first components to inspect. Loose pins, corrosion, or physical damage to the connector or harness can interrupt the signal between the sensor and the control board, producing readings that the board interprets as a sensor failure. A thorough inspection of the entire board connection harness is also warranted, as a loose or damaged connector elsewhere in the harness can contribute to the fault.

If the wiring and connectors check out and appear intact, attention should turn to the microwave cavity temperature sensor itself. A sensor that has drifted out of specification, developed an internal open circuit, or suffered heat damage will produce incorrect resistance values and trigger this code. In some cases, the main control board may be responsible if it is misreading a signal from an otherwise functional sensor and harness.