Jenn-Air Oven Error Code F4E4

The F4E4 error code on a Jenn-Air oven indicates a fault in the microwave humidity sensor circuit. This sensor, sometimes called a steam sensor, monitors moisture levels in the oven cavity during microwave and combination cooking cycles. It allows the control board to detect steam output and adjust cooking parameters accordingly. When the control board cannot read a valid signal from this sensor, or receives a signal that falls outside expected parameters, it logs F4E4 and may interrupt the current cooking cycle.

The humidity sensor is typically located inside the oven cavity and communicates with the main control board via a dedicated signal circuit. Causes of this fault generally fall into two categories: sensor hardware failure and wiring or connection issues. Condensation from heavy steam cooking can corrode connector pins or degrade wiring insulation over time. In some cases, a sensor that is coated with grease or food residue may produce inaccurate readings that trigger the fault even when the sensor itself is electrically intact.

The recommended first diagnostic step is to run a steam function and wait one minute to observe whether the code reappears. If the error clears and does not return, the fault may have been intermittent due to a temporary signal dropout or residual moisture on sensor contacts. If the code returns consistently during steam operation, further inspection of the sensor, its wiring harness, and the control board connection is warranted to isolate the root cause.