Thermador Cooktop Error Code F0123

F0123 indicates that the electronics inside the left ADB induction module have overheated. The cooktop automatically shuts off the affected hobs to protect those electronic components from heat damage. This is a built-in safety feature. The unit should recover after cooling down for 20 to 30 minutes, but recurring faults point to an underlying issue that needs diagnosis.

No. When F0123 triggers, the cooktop has already shut off the affected hobs as a protective measure, so continued use of those zones is not possible until the fault clears. Attempting to force operation or repeatedly resetting without addressing the root cause can lead to cumulative heat damage to the induction module's electronics. Allow the unit to fully cool and identify the cause before resuming normal cooking.

Start by switching the cooktop off and letting it cool for 20 to 30 minutes, then check that all ventilation openings around and beneath the cooktop are unobstructed. Confirm the unit is installed with adequate clearance as required for the model. If the error returns quickly under normal cooking conditions after confirming airflow is adequate, the problem likely involves an internal component such as the cooling fan or temperature sensor, and a qualified technician should inspect the unit.

A simple power cycle may clear the fault display, but the error will return if the underlying cause is not resolved. The correct first step is to switch the appliance off and allow it to cool for at least 20 to 30 minutes before attempting to restart. If the fault reappears quickly during the next use, a physical cause such as a blocked vent or a failed cooling fan needs to be investigated.

Repair costs depend entirely on the root cause. If the fix involves clearing a blocked vent or improving kitchen airflow, there may be no parts cost at all. Replacing a cooling fan typically involves a moderate parts cost plus labor. If the left ADB induction module board itself needs replacement, costs can range from several hundred to over a thousand dollars depending on parts availability and labor rates in your area.