GE Range Error Code F4 E2

F4 E2 on a GE range indicates an over-temperature condition during cook mode, specifically a temperature runaway event. This means the oven's control board detected that the cavity temperature exceeded safe operating limits or continued rising beyond the setpoint without the expected regulation. The control monitors feedback from the oven temperature sensor (RTD probe) and compares it against the active setpoint. When the temperature climbs unchecked, the board flags this fault to prevent damage to the appliance or a potential fire hazard.

The most direct cause of temperature runaway is a bake relay that has welded shut or failed in the closed position. When a relay contacts fuse together, the bake element receives continuous power regardless of control board commands, causing the oven to heat without stopping. The first diagnostic step reflects this: entering diagnostics mode and pressing the BAKE key to manually cycle the bake relay on and off confirms whether the relay is responding to control signals or is stuck closed.

Additional causes include a failed oven temperature sensor sending incorrect resistance readings to the control board, or a faulty control board that is not properly interrupting power to the element. A sensor that reads artificially low temperatures will cause the board to keep the element energized far beyond the correct setpoint, mimicking a runaway condition. Diagnosing this fault requires isolating whether the problem originates at the relay, the sensor, or the board itself.