Thermador Cooktop Error Code E4

E4 indicates a temperature sensor short circuit detected during active cooking. The control board monitors the sensor's resistance continuously while the unit is in use, and when it detects a value consistent with a short circuit, it waits 60 seconds to confirm the fault and then shuts down the affected oven. A properly functioning sensor should read approximately 1050 ohms at room temperature.

No, you should not continue using the cooktop while E4 is active. The error triggers an automatic shutoff specifically because a shorted sensor means the control board cannot accurately monitor cooking temperature. Operating without reliable temperature feedback risks uncontrolled overheating. The unit should remain out of service until the fault is diagnosed and repaired.

Repair costs depend on what component has failed. A replacement temperature sensor typically costs in the range of $30 to $80 for the part alone. If professional labor is required, total repair costs including diagnosis and installation generally range from $150 to $350. A control board replacement, if needed, will be at the higher end of the cost spectrum and could exceed that range depending on the specific model.

A knowledgeable DIYer can start by measuring the temperature sensor resistance with a multimeter at the sensor terminals and comparing it to the expected value of approximately 1050 ohms at room temperature. If the reading is significantly lower, the sensor likely needs replacement. Wiring inspection and connector cleaning are also within reach for experienced DIYers, but if the control board is suspected, professional diagnosis is recommended.

A power reset may temporarily clear the error display, but the fault will return as soon as the unit enters an active cooking cycle and the control board re-detects the sensor short circuit condition. Because the 60-second debounce only applies during active use, the underlying problem with the sensor or wiring must be physically corrected for the error to stay resolved.