Thermador Cooktop Error Code W4

W4 means the cooktop detected an over-temperature condition in the user interface, which is the touch control panel area. The system shuts down all cooking zones automatically to protect the electronics from heat damage. This is most commonly caused by large or hot cookware placed too close to the control surface. Once the interface cools down, the zones will become available again.

The cooktop is designed to prevent unsafe operation by locking out all zones when W4 triggers, so the protective system is working correctly. It is safe to resume cooking once the error clears and the zones come back online. However, if the error appears frequently during normal use with appropriately sized cookware, you should have the unit inspected to rule out a sensor or control board issue.

If W4 is caused by cookware placement or heat buildup, there is no repair cost since the fix is simply removing objects and allowing cooling. If the error is traced to a faulty thermal sensor or control board, repair costs typically range from a few hundred dollars to over five hundred dollars depending on the specific part and labor rates in your area. Diagnostic fees from a certified technician generally range from fifty to one hundred dollars and may be applied toward the total repair cost.

Remove all cookware and any objects from the cooktop surface, paying particular attention to the area near the touch controls. Allow the control panel area to cool down naturally without forcing ventilation or using water. Once the temperature drops back to a safe level, the cooktop will automatically restore zone operation. No tools or service call is needed if the error clears after cooling.

A power reset is generally not necessary to clear W4 because the cooktop resolves the condition on its own once the interface temperature drops. Simply removing cookware and waiting for the surface to cool is the correct approach. If W4 persists or returns immediately after cooling even without any cookware on the surface, then cycling the power and monitoring for recurrence can help determine whether a component fault is involved.