Thermador Range Error Code E6

The E6 error code on a Thermador range signals an over-temperature condition during cooking or self-clean operation. Specifically, the oven cavity temperature has exceeded 635 degrees Fahrenheit without the control system commanding that level of heat, indicating a runaway thermal event. The control board monitors the oven temperature sensor continuously, and when the measured temperature surpasses this threshold, the E6 fault is logged and the system flags the condition as a potential safety hazard.

The primary component involved is the oven temperature sensor, also called an RTD (resistance temperature detector) or oven probe. If the sensor develops an internal short or reads incorrectly low resistance, it can report a temperature lower than actual to the control board. In response, the board keeps the bake or broil element energized beyond safe limits, driving the cavity temperature into runaway. A faulty relay on the control board that sticks closed is another path to this condition, allowing continuous power to the heating element regardless of sensor feedback.

The code clears automatically once the oven temperature drops below the runaway threshold and the selector switch is placed in the off position. This behavior is important for diagnostics: if the error returns quickly after clearing, the underlying fault is still active. Technicians should begin by verifying the temperature sensor's resistance at room temperature and checking for any signs of element damage or relay failure on the control board before returning the appliance to service.