Thermador Cooktop Error Code W3

W3 indicates that the induction electronics, specifically the main board (MB) or auxiliary driver board (ADB), have overheated and triggered an automatic protective shutdown. The cooktop cuts power to prevent permanent damage to the sensitive electronic components. It will not operate again until the boards cool to a safe temperature and the unit is reset.

No, you should stop cooking and allow the unit to cool down when W3 is displayed. The cooktop's auto shut-off has already cut power to the induction circuits to protect the electronics. Attempting to bypass or repeatedly restart the unit before it cools could accelerate damage to the MB or ADB boards.

If the cause is simply a blocked vent or a one-time overuse event, there is no repair cost involved. A cooling fan replacement typically runs in the range of $100 to $250 including parts and labor. If the main board or auxiliary driver board requires replacement, repair costs can range from $300 to $700 or more depending on the specific board and labor rates in your area.

A reset can clear the W3 error, but only after the unit has been allowed to cool down fully first. Power the cooktop off at the circuit breaker or disconnect power for several minutes, then restore power once the electronics have cooled. If W3 returns quickly or repeatedly during normal use, a reset alone will not solve the underlying problem.

Start by turning the cooktop off and letting it cool for at least 20 to 30 minutes. Check that all ventilation clearances around and beneath the unit are unobstructed. After cooling, perform a reset by cycling the circuit breaker. If the error returns during normal use, inspect the internal cooling fan for obstructions or failure, and consider having a technician evaluate the MB and ADB boards.