Kenmore Range Error Code F4 E2

The F4 E2 error code on a Kenmore range indicates an over-temperature condition during a cook cycle, specifically a temperature runaway event. This means the oven temperature has climbed beyond acceptable limits and is not being regulated properly by the control system. The oven control board monitors temperature through a sensor and cycles the bake relay on and off to maintain the setpoint. When the board detects that the temperature is rising uncontrollably or exceeding the safe threshold, it triggers this fault and shuts down the cooking operation to prevent damage or a fire hazard.

The bake relay is a critical component in this fault. It is responsible for energizing and de-energizing the bake element during normal operation. If the relay contacts weld together in the closed position, the bake element receives continuous power and the oven has no way to reduce heat, resulting in temperature runaway. The first diagnostic step is to enter the range's diagnostic mode and press the BAKE key to cycle the bake relay on and off, which confirms whether the relay is operating correctly or is stuck.

Beyond a failed relay, a faulty oven temperature sensor or a defective control board can also produce this condition. A sensor that reads lower than actual temperature will cause the board to keep the element energized longer than necessary. A control board with failed relay drivers or logic errors may also fail to open the relay circuit at the correct time. Properly diagnosing which component is responsible requires testing relay operation in diagnostic mode first, then checking sensor resistance, and finally evaluating the control board if other components test within spec.