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Error code reference

Thermador Cooktop Error Code F0123

Overheating of the electronics of the left ADB induction module: electronic components

Thermador codesThermador cooktop codes

Overheating of the electronics of the left ADB induction module: electronic components — hobs switched off to prevent overheating.

First step from the service manual

Switch off the appliance and leave it to cool down for 20-30 minutes.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F0123 means on a Thermador cooktop

The F0123 error code on a Thermador induction cooktop indicates that the electronics within the left ADB (Active Dynamic Boost) induction module have reached an unsafe operating temperature. As a protective measure, the cooktop's firmware automatically shuts down the affected hobs to prevent thermal damage to sensitive electronic components on the module's control board. This is a hard safety cutoff, not a soft warning, meaning the unit will not resume operation until conditions are within acceptable limits.

The ADB induction module contains power switching components, including IGBTs (insulated gate bipolar transistors) and associated driver circuitry, which generate significant heat during high-power cooking cycles. These components rely on adequate airflow and functional thermal management systems to stay within safe temperature ranges. When heat dissipation is compromised, internal temperature sensors trigger the F0123 fault to protect the board from permanent damage.

Common contributors include blocked ventilation pathways beneath or around the cooktop, a failed or obstructed cooling fan within the module, prolonged high-power use in a warm kitchen environment, or a failing thermal sensor that is reading incorrectly. In some cases, accumulated grease or debris on internal components can restrict airflow enough to cause repeated overheating events. Addressing the root cause is critical, because repeated thermal shutdowns without resolution can degrade the module's electronics over time.

Source: manufacturer service documentation.

Common causes of F0123

  1. 01

    Blocked or restricted ventilation

    Wiring / connection

    Cooktops installed in tight cutouts without adequate clearance, or with vents blocked by debris or cookware stored underneath, cannot dissipate heat properly. Check that all ventilation slots are clear and that installation clearances match Thermador specifications.

  2. 02

    Failed or obstructed cooling fan

    Part replacement

    The ADB induction module relies on an internal cooling fan to move air across heat-generating components. If the fan has failed, is running slowly, or is clogged with debris, thermal buildup will trigger F0123 during normal cooking cycles.

  3. 03

    Prolonged high-power cooking session

    Wiring / connection

    Extended use of the left zone at maximum power settings, especially in a warm kitchen or during warm weather, can push module temperatures beyond the threshold. A single long cooking event may be the trigger, and the unit should recover after a 20 to 30 minute cool-down.

  4. 04

    Faulty NTC temperature sensor on the module

    Part replacement

    If the thermal sensor monitoring the ADB module is reading incorrectly, it may report overtemperature conditions even when actual component temperatures are within range. This would cause repeated or premature F0123 faults that do not resolve with cooling.

  5. 05

    Failing or degraded ADB induction module board

    Part replacement

    Aging power components such as IGBTs can become less efficient over time, generating more heat than normal under standard loads. If the error recurs consistently and all other causes are ruled out, the left ADB module itself may need replacement.

See the test procedure for each cause

Frequently asked questions about F0123

What does F0123 mean on a Thermador cooktop?
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.
Will turning the cooktop off and back on clear the F0123 error?
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.
Is it safe to keep using the cooktop when F0123 appears?
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.
How much does it cost to repair a Thermador cooktop showing F0123?
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.
What should I check before calling a technician about F0123?
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.

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